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commit 93faccbbfa958a9668d3ab4e30f38dd205cee8d8 upstream.
To support unprivileged users mounting filesystems two permission
checks have to be performed: a test to see if the user allowed to
create a mount in the mount namespace, and a test to see if
the user is allowed to access the specified filesystem.
The automount case is special in that mounting the original filesystem
grants permission to mount the sub-filesystems, to any user who
happens to stumble across the their mountpoint and satisfies the
ordinary filesystem permission checks.
Attempting to handle the automount case by using override_creds
almost works. It preserves the idea that permission to mount
the original filesystem is permission to mount the sub-filesystem.
Unfortunately using override_creds messes up the filesystems
ordinary permission checks.
Solve this by being explicit that a mount is a submount by introducing
vfs_submount, and using it where appropriate.
vfs_submount uses a new mount internal mount flags MS_SUBMOUNT, to let
sget and friends know that a mount is a submount so they can take appropriate
action.
sget and sget_userns are modified to not perform any permission checks
on submounts.
follow_automount is modified to stop using override_creds as that
has proven problemantic.
do_mount is modified to always remove the new MS_SUBMOUNT flag so
that we know userspace will never by able to specify it.
autofs4 is modified to stop using current_real_cred that was put in
there to handle the previous version of submount permission checking.
cifs is modified to pass the mountpoint all of the way down to vfs_submount.
debugfs is modified to pass the mountpoint all of the way down to
trace_automount by adding a new parameter. To make this change easier
a new typedef debugfs_automount_t is introduced to capture the type of
the debugfs automount function.
Fixes: 069d5ac9ae0d ("autofs: Fix automounts by using current_real_cred()->uid")
Fixes: aeaa4a79ff6a ("fs: Call d_automount with the filesystems creds")
Reviewed-by: Trond Myklebust <trond.myklebust@primarydata.com>
Reviewed-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: I09cb1f35368fb8dc4a64b5ac5a35c9d2843ef95b
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Allowing a filesystem to be mounted by other than root in the initial
user namespace is a filesystem property not a mount namespace property
and as such should be checked in filesystem specific code. Move the
FS_USERNS_MOUNT test into super.c:sget_userns().
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Change-Id: I5da9f5ce3e7b85379a771617e3238817b777eab4
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Return -EPERM if an owning user namespace is outside of a process
current user namespace.
v2: In a first version ns_get_owner returned ENOENT for init_user_ns.
This special cases was removed from this version. There is nothing
outside of init_user_ns, so we can return EPERM.
v3: rename ns->get_owner() to ns->owner(). get_* usually means that it
grabs a reference.
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Chatur27 <jasonbright2709@gmail.com>
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lineage-18.1-caf-msm8998
# By Thomas Gleixner (11) and others
# Via Greg Kroah-Hartman
* google/common/android-4.4-p:
Linux 4.4.283
Revert "floppy: reintroduce O_NDELAY fix"
fbmem: add margin check to fb_check_caps()
vt_kdsetmode: extend console locking
vringh: Use wiov->used to check for read/write desc order
virtio: Improve vq->broken access to avoid any compiler optimization
net: marvell: fix MVNETA_TX_IN_PRGRS bit number
e1000e: Fix the max snoop/no-snoop latency for 10M
USB: serial: option: add new VID/PID to support Fibocom FG150
Revert "USB: serial: ch341: fix character loss at high transfer rates"
can: usb: esd_usb2: esd_usb2_rx_event(): fix the interchange of the CAN RX and TX error counters
Linux 4.4.282
mmc: dw_mmc: Fix occasional hang after tuning on eMMC
ASoC: intel: atom: Fix breakage for PCM buffer address setup
ipack: tpci200: fix many double free issues in tpci200_pci_probe
ALSA: hda - fix the 'Capture Switch' value change notifications
mmc: dw_mmc: Fix hang on data CRC error
mmc: dw_mmc: call the dw_mci_prep_stop_abort() by default
mmc: dw_mmc: Wait for data transfer after response errors.
net: qlcnic: add missed unlock in qlcnic_83xx_flash_read32
net: 6pack: fix slab-out-of-bounds in decode_data
dccp: add do-while-0 stubs for dccp_pr_debug macros
Bluetooth: hidp: use correct wait queue when removing ctrl_wait
scsi: core: Avoid printing an error if target_alloc() returns -ENXIO
scsi: megaraid_mm: Fix end of loop tests for list_for_each_entry()
dmaengine: of-dma: router_xlate to return -EPROBE_DEFER if controller is not yet available
ARM: dts: am43x-epos-evm: Reduce i2c0 bus speed for tps65218
dmaengine: usb-dmac: Fix PM reference leak in usb_dmac_probe()
KVM: nSVM: avoid picking up unsupported bits from L2 in int_ctl (CVE-2021-3653)
vmlinux.lds.h: Handle clang's module.{c,d}tor sections
PCI/MSI: Enforce MSI[X] entry updates to be visible
PCI/MSI: Enforce that MSI-X table entry is masked for update
PCI/MSI: Mask all unused MSI-X entries
PCI/MSI: Protect msi_desc::masked for multi-MSI
PCI/MSI: Use msi_mask_irq() in pci_msi_shutdown()
PCI/MSI: Correct misleading comments
PCI/MSI: Do not set invalid bits in MSI mask
PCI/MSI: Enable and mask MSI-X early
x86/tools: Fix objdump version check again
xen/events: Fix race in set_evtchn_to_irq
net: Fix memory leak in ieee802154_raw_deliver
i2c: dev: zero out array used for i2c reads from userspace
ASoC: intel: atom: Fix reference to PCM buffer address
ANDROID: xt_quota2: set usersize in xt_match registration object
ANDROID: xt_quota2: clear quota2_log message before sending
ANDROID: xt_quota2: remove trailing junk which might have a digit in it
UPSTREAM: netfilter: x_tables: fix pointer leaks to userspace
Linux 4.4.281
ovl: prevent private clone if bind mount is not allowed
net: xilinx_emaclite: Do not print real IOMEM pointer
USB:ehci:fix Kunpeng920 ehci hardware problem
pipe: increase minimum default pipe size to 2 pages
net/qla3xxx: fix schedule while atomic in ql_wait_for_drvr_lock and ql_adapter_reset
alpha: Send stop IPI to send to online CPUs
reiserfs: check directory items on read from disk
reiserfs: add check for root_inode in reiserfs_fill_super
pcmcia: i82092: fix a null pointer dereference bug
MIPS: Malta: Do not byte-swap accesses to the CBUS UART
serial: 8250: Mask out floating 16/32-bit bus bits
media: rtl28xxu: fix zero-length control request
scripts/tracing: fix the bug that can't parse raw_trace_func
USB: serial: ftdi_sio: add device ID for Auto-M3 OP-COM v2
USB: serial: ch341: fix character loss at high transfer rates
USB: serial: option: add Telit FD980 composition 0x1056
Bluetooth: defer cleanup of resources in hci_unregister_dev()
net: vxge: fix use-after-free in vxge_device_unregister
net: pegasus: fix uninit-value in get_interrupt_interval
bnx2x: fix an error code in bnx2x_nic_load()
mips: Fix non-POSIX regexp
net: natsemi: Fix missing pci_disable_device() in probe and remove
media: videobuf2-core: dequeue if start_streaming fails
scsi: sr: Return correct event when media event code is 3
ALSA: seq: Fix racy deletion of subscriber
Linux 4.4.280
rcu: Update documentation of rcu_read_unlock()
futex,rt_mutex: Fix rt_mutex_cleanup_proxy_lock()
futex: Avoid freeing an active timer
futex: Handle transient "ownerless" rtmutex state correctly
rtmutex: Make wait_lock irq safe
futex: Futex_unlock_pi() determinism
futex: Rework futex_lock_pi() to use rt_mutex_*_proxy_lock()
futex: Pull rt_mutex_futex_unlock() out from under hb->lock
futex,rt_mutex: Introduce rt_mutex_init_waiter()
futex: Cleanup refcounting
futex: Rename free_pi_state() to put_pi_state()
Linux 4.4.279
can: raw: raw_setsockopt(): fix raw_rcv panic for sock UAF
Revert "Bluetooth: Shutdown controller after workqueues are flushed or cancelled"
net: Fix zero-copy head len calculation.
r8152: Fix potential PM refcount imbalance
regulator: rt5033: Fix n_voltages settings for BUCK and LDO
btrfs: mark compressed range uptodate only if all bio succeed
Conflicts:
net/bluetooth/hci_core.c
net/netfilter/xt_quota2.c
Change-Id: I66e2384c8cc40448a7bff34bb935c74e6103e924
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Changes in 4.4.281
ALSA: seq: Fix racy deletion of subscriber
scsi: sr: Return correct event when media event code is 3
media: videobuf2-core: dequeue if start_streaming fails
net: natsemi: Fix missing pci_disable_device() in probe and remove
mips: Fix non-POSIX regexp
bnx2x: fix an error code in bnx2x_nic_load()
net: pegasus: fix uninit-value in get_interrupt_interval
net: vxge: fix use-after-free in vxge_device_unregister
Bluetooth: defer cleanup of resources in hci_unregister_dev()
USB: serial: option: add Telit FD980 composition 0x1056
USB: serial: ch341: fix character loss at high transfer rates
USB: serial: ftdi_sio: add device ID for Auto-M3 OP-COM v2
scripts/tracing: fix the bug that can't parse raw_trace_func
media: rtl28xxu: fix zero-length control request
serial: 8250: Mask out floating 16/32-bit bus bits
MIPS: Malta: Do not byte-swap accesses to the CBUS UART
pcmcia: i82092: fix a null pointer dereference bug
reiserfs: add check for root_inode in reiserfs_fill_super
reiserfs: check directory items on read from disk
alpha: Send stop IPI to send to online CPUs
net/qla3xxx: fix schedule while atomic in ql_wait_for_drvr_lock and ql_adapter_reset
pipe: increase minimum default pipe size to 2 pages
USB:ehci:fix Kunpeng920 ehci hardware problem
net: xilinx_emaclite: Do not print real IOMEM pointer
ovl: prevent private clone if bind mount is not allowed
Linux 4.4.281
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I23014eec5c0648b030387cc4469a1cdfaa2c14a1
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commit 427215d85e8d1476da1a86b8d67aceb485eb3631 upstream.
Add the following checks from __do_loopback() to clone_private_mount() as
well:
- verify that the mount is in the current namespace
- verify that there are no locked children
Reported-by: Alois Wohlschlager <alois1@gmx-topmail.de>
Fixes: c771d683a62e ("vfs: introduce clone_private_mount()")
Cc: <stable@vger.kernel.org> # v3.18
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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https://android.googlesource.com/kernel/common into lineage-17.1-caf-msm8998
This brings LA.UM.8.4.r1-05400-8x98.0 up to date with
https://android.googlesource.com/kernel/common/ android-4.4-p at commit:
96b09cba55905 UPSTREAM: net: socket: set sock->sk to NULL after calling proto_ops::release()
Conflicts:
drivers/scsi/ufs/ufshcd.c
drivers/usb/gadget/composite.c
drivers/usb/gadget/function/f_fs.c
Change-Id: I3e79c0d20e3eb3246a50c9a1e815cdf030a4232e
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Changes in 4.4.221
ext4: fix extent_status fragmentation for plain files
ALSA: hda - Fix incorrect usage of IS_REACHABLE()
net: ipv4: emulate READ_ONCE() on ->hdrincl bit-field in raw_sendmsg()
net: ipv4: avoid unused variable warning for sysctl
crypto: mxs-dcp - make symbols 'sha1_null_hash' and 'sha256_null_hash' static
vti4: removed duplicate log message.
scsi: lpfc: Fix kasan slab-out-of-bounds error in lpfc_unreg_login
ceph: return ceph_mdsc_do_request() errors from __get_parent()
ceph: don't skip updating wanted caps when cap is stale
pwm: rcar: Fix late Runtime PM enablement
scsi: iscsi: Report unbind session event when the target has been removed
ASoC: Intel: atom: Take the drv->lock mutex before calling sst_send_slot_map()
kernel/gcov/fs.c: gcov_seq_next() should increase position index
ipc/util.c: sysvipc_find_ipc() should increase position index
s390/cio: avoid duplicated 'ADD' uevents
pwm: renesas-tpu: Fix late Runtime PM enablement
pwm: bcm2835: Dynamically allocate base
ipv6: fix restrict IPV6_ADDRFORM operation
macvlan: fix null dereference in macvlan_device_event()
net: netrom: Fix potential nr_neigh refcnt leak in nr_add_node
net/x25: Fix x25_neigh refcnt leak when receiving frame
tcp: cache line align MAX_TCP_HEADER
team: fix hang in team_mode_get()
xfrm: Always set XFRM_TRANSFORMED in xfrm{4,6}_output_finish
ALSA: hda: Remove ASUS ROG Zenith from the blacklist
iio: xilinx-xadc: Fix ADC-B powerdown
iio: xilinx-xadc: Fix clearing interrupt when enabling trigger
iio: xilinx-xadc: Fix sequencer configuration for aux channels in simultaneous mode
fs/namespace.c: fix mountpoint reference counter race
USB: sisusbvga: Change port variable from signed to unsigned
USB: Add USB_QUIRK_DELAY_CTRL_MSG and USB_QUIRK_DELAY_INIT for Corsair K70 RGB RAPIDFIRE
drivers: usb: core: Don't disable irqs in usb_sg_wait() during URB submit.
drivers: usb: core: Minimize irq disabling in usb_sg_cancel()
USB: core: Fix free-while-in-use bug in the USB S-Glibrary
USB: hub: Fix handling of connect changes during sleep
ALSA: usx2y: Fix potential NULL dereference
ALSA: usb-audio: Fix usb audio refcnt leak when getting spdif
ALSA: usb-audio: Filter out unsupported sample rates on Focusrite devices
KVM: Check validity of resolved slot when searching memslots
KVM: VMX: Enable machine check support for 32bit targets
tty: hvc: fix buffer overflow during hvc_alloc().
tty: rocket, avoid OOB access
usb-storage: Add unusual_devs entry for JMicron JMS566
audit: check the length of userspace generated audit records
ASoC: dapm: fixup dapm kcontrol widget
ARM: imx: provide v7_cpu_resume() only on ARM_CPU_SUSPEND=y
staging: comedi: dt2815: fix writing hi byte of analog output
staging: comedi: Fix comedi_device refcnt leak in comedi_open
staging: vt6656: Fix drivers TBTT timing counter.
staging: vt6656: Power save stop wake_up_count wrap around.
UAS: no use logging any details in case of ENODEV
UAS: fix deadlock in error handling and PM flushing work
usb: f_fs: Clear OS Extended descriptor counts to zero in ffs_data_reset()
remoteproc: Fix wrong rvring index computation
sctp: use right member as the param of list_for_each_entry
fuse: fix possibly missed wake-up after abort
mtd: cfi: fix deadloop in cfi_cmdset_0002.c do_write_buffer
usb: gadget: udc: bdc: Remove unnecessary NULL checks in bdc_req_complete
net/cxgb4: Check the return from t4_query_params properly
perf/core: fix parent pid/tid in task exit events
bpf, x86: Fix encoding for lower 8-bit registers in BPF_STX BPF_B
scsi: target: fix PR IN / READ FULL STATUS for FC
xen/xenbus: ensure xenbus_map_ring_valloc() returns proper grant status
ext4: convert BUG_ON's to WARN_ON's in mballoc.c
ext4: avoid declaring fs inconsistent due to invalid file handles
ext4: protect journal inode's blocks using block_validity
ext4: don't perform block validity checks on the journal inode
ext4: fix block validity checks for journal inodes using indirect blocks
ext4: unsigned int compared against zero
propagate_one(): mnt_set_mountpoint() needs mount_lock
Linux 4.4.221
Change-Id: I95cadd4206a7c89541de002faacea3a28e7b1ac3
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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A race condition between threads updating mountpoint reference counter
affects longterm releases 4.4.220, 4.9.220, 4.14.177 and 4.19.118.
The mountpoint reference counter corruption may occur when:
* one thread increments m_count member of struct mountpoint
[under namespace_sem, but not holding mount_lock]
pivot_root()
* another thread simultaneously decrements the same m_count
[under mount_lock, but not holding namespace_sem]
put_mountpoint()
unhash_mnt()
umount_mnt()
mntput_no_expire()
To fix this race condition, grab mount_lock before updating m_count in
pivot_root().
Reference: CVE-2020-12114
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Piotr Krysiuk <piotras@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Changes in 4.4.164
bcache: fix miss key refill->end in writeback
hwmon: (pmbus) Fix page count auto-detection.
jffs2: free jffs2_sb_info through jffs2_kill_sb()
pcmcia: Implement CLKRUN protocol disabling for Ricoh bridges
ipmi: Fix timer race with module unload
parisc: Fix address in HPMC IVA
parisc: Fix map_pages() to not overwrite existing pte entries
ALSA: hda - Add mic quirk for the Lenovo G50-30 (17aa:3905)
ALSA: ca0106: Disable IZD on SB0570 DAC to fix audio pops
x86/corruption-check: Fix panic in memory_corruption_check() when boot option without value is provided
x86/kconfig: Fall back to ticket spinlocks
sparc: Fix single-pcr perf event counter management.
x86/fpu: Remove second definition of fpu in __fpu__restore_sig()
net: qla3xxx: Remove overflowing shift statement
selftests: ftrace: Add synthetic event syntax testcase
locking/lockdep: Fix debug_locks off performance problem
ataflop: fix error handling during setup
swim: fix cleanup on setup error
tun: Consistently configure generic netdev params via rtnetlink
perf tools: Free temporary 'sys' string in read_event_files()
perf tools: Cleanup trace-event-info 'tdata' leak
mmc: sdhci-pci-o2micro: Add quirk for O2 Micro dev 0x8620 rev 0x01
Bluetooth: btbcm: Add entry for BCM4335C0 UART bluetooth
x86: boot: Fix EFI stub alignment
pinctrl: qcom: spmi-mpp: Fix err handling of pmic_mpp_set_mux
kprobes: Return error if we fail to reuse kprobe instead of BUG_ON()
ACPI / LPSS: Add alternative ACPI HIDs for Cherry Trail DMA controllers
pinctrl: qcom: spmi-mpp: Fix drive strength setting
pinctrl: spmi-mpp: Fix pmic_mpp_config_get() to be compliant
pinctrl: ssbi-gpio: Fix pm8xxx_pin_config_get() to be compliant
ath10k: schedule hardware restart if WMI command times out
scsi: esp_scsi: Track residual for PIO transfers
scsi: megaraid_sas: fix a missing-check bug
tpm: suppress transmit cmd error logs when TPM 1.2 is disabled/deactivated
ext4: fix argument checking in EXT4_IOC_MOVE_EXT
MD: fix invalid stored role for a disk
usb: chipidea: Prevent unbalanced IRQ disable
driver/dma/ioat: Call del_timer_sync() without holding prep_lock
uio: ensure class is registered before devices
scsi: lpfc: Correct soft lockup when running mds diagnostics
signal: Always deliver the kernel's SIGKILL and SIGSTOP to a pid namespace init
dmaengine: dma-jz4780: Return error if not probed from DT
ALSA: hda: Check the non-cached stream buffers more explicitly
xen-swiotlb: use actually allocated size on check physical continuous
tpm: Restore functionality to xen vtpm driver.
xen: fix race in xen_qlock_wait()
xen: make xen_qlock_wait() nestable
net/ipv4: defensive cipso option parsing
libnvdimm: Hold reference on parent while scheduling async init
jbd2: fix use after free in jbd2_log_do_checkpoint()
gfs2_meta: ->mount() can get NULL dev_name
ext4: initialize retries variable in ext4_da_write_inline_data_begin()
HID: hiddev: fix potential Spectre v1
PCI: Add Device IDs for Intel GPU "spurious interrupt" quirk
signal/GenWQE: Fix sending of SIGKILL
crypto: lrw - Fix out-of bounds access on counter overflow
ima: fix showing large 'violations' or 'runtime_measurements_count'
hugetlbfs: dirty pages as they are added to pagecache
kbuild: fix kernel/bounds.c 'W=1' warning
iio: adc: at91: fix acking DRDY irq on simple conversions
iio: adc: at91: fix wrong channel number in triggered buffer mode
w1: omap-hdq: fix missing bus unregister at removal
smb3: allow stats which track session and share reconnects to be reset
smb3: do not attempt cifs operation in smb3 query info error path
smb3: on kerberos mount if server doesn't specify auth type use krb5
printk: Fix panic caused by passing log_buf_len to command line
genirq: Fix race on spurious interrupt detection
NFSv4.1: Fix the r/wsize checking
nfsd: Fix an Oops in free_session()
lockd: fix access beyond unterminated strings in prints
dm ioctl: harden copy_params()'s copy_from_user() from malicious users
powerpc/msi: Fix compile error on mpc83xx
MIPS: OCTEON: fix out of bounds array access on CN68XX
TC: Set DMA masks for devices
kgdboc: Passing ekgdboc to command line causes panic
xen: fix xen_qlock_wait()
media: em28xx: use a default format if TRY_FMT fails
media: em28xx: fix input name for Terratec AV 350
media: em28xx: make v4l2-compliance happier by starting sequence on zero
ext4: avoid running out of journal credits when appending to an inline file
Cramfs: fix abad comparison when wrap-arounds occur
arm64: dts: stratix10: Correct System Manager register size
soc/tegra: pmc: Fix child-node lookup
btrfs: Handle owner mismatch gracefully when walking up tree
btrfs: locking: Add extra check in btrfs_init_new_buffer() to avoid deadlock
btrfs: iterate all devices during trim, instead of fs_devices::alloc_list
btrfs: don't attempt to trim devices that don't support it
btrfs: wait on caching when putting the bg cache
btrfs: reset max_extent_size on clear in a bitmap
btrfs: make sure we create all new block groups
Btrfs: fix wrong dentries after fsync of file that got its parent replaced
btrfs: qgroup: Dirty all qgroups before rescan
Btrfs: fix null pointer dereference on compressed write path error
btrfs: set max_extent_size properly
MD: fix invalid stored role for a disk - try2
tty: check name length in tty_find_polling_driver()
powerpc/nohash: fix undefined behaviour when testing page size support
drm/omap: fix memory barrier bug in DMM driver
media: pci: cx23885: handle adding to list failure
MIPS: kexec: Mark CPU offline before disabling local IRQ
powerpc/boot: Ensure _zimage_start is a weak symbol
sc16is7xx: Fix for multi-channel stall
media: tvp5150: fix width alignment during set_selection()
9p locks: fix glock.client_id leak in do_lock
9p: clear dangling pointers in p9stat_free
cdrom: fix improper type cast, which can leat to information leak.
scsi: qla2xxx: Fix incorrect port speed being set for FC adapters
fuse: Fix use-after-free in fuse_dev_do_read()
fuse: Fix use-after-free in fuse_dev_do_write()
fuse: fix blocked_waitq wakeup
fuse: set FR_SENT while locked
mm, elf: handle vm_brk error
binfmt_elf: fix calculations for bss padding
mm: refuse wrapped vm_brk requests
fs, elf: make sure to page align bss in load_elf_library
mm: do not bug_on on incorrect length in __mm_populate()
e1000: avoid null pointer dereference on invalid stat type
e1000: fix race condition between e1000_down() and e1000_watchdog
bna: ethtool: Avoid reading past end of buffer
MIPS: Loongson-3: Fix CPU UART irq delivery problem
MIPS: Loongson-3: Fix BRIDGE irq delivery problem
xtensa: add NOTES section to the linker script
xtensa: make sure bFLT stack is 16 byte aligned
xtensa: fix boot parameters address translation
clk: s2mps11: Fix matching when built as module and DT node contains compatible
libceph: bump CEPH_MSG_MAX_DATA_LEN
mach64: fix display corruption on big endian machines
mach64: fix image corruption due to reading accelerator registers
vhost/scsi: truncate T10 PI iov_iter to prot_bytes
ocfs2: fix a misuse a of brelse after failing ocfs2_check_dir_entry
mm: thp: relax __GFP_THISNODE for MADV_HUGEPAGE mappings
mtd: docg3: don't set conflicting BCH_CONST_PARAMS option
termios, tty/tty_baudrate.c: fix buffer overrun
arch/alpha, termios: implement BOTHER, IBSHIFT and termios2
Btrfs: fix data corruption due to cloning of eof block
clockevents/drivers/i8253: Add support for PIT shutdown quirk
ext4: add missing brelse() update_backups()'s error path
ext4: add missing brelse() in set_flexbg_block_bitmap()'s error path
ext4: add missing brelse() add_new_gdb_meta_bg()'s error path
ext4: avoid potential extra brelse in setup_new_flex_group_blocks()
ext4: fix possible inode leak in the retry loop of ext4_resize_fs()
ext4: avoid buffer leak in ext4_orphan_add() after prior errors
ext4: fix missing cleanup if ext4_alloc_flex_bg_array() fails while resizing
ext4: avoid possible double brelse() in add_new_gdb() on error path
ext4: fix possible leak of sbi->s_group_desc_leak in error path
ext4: release bs.bh before re-using in ext4_xattr_block_find()
ext4: fix buffer leak in ext4_xattr_move_to_block() on error path
ext4: fix buffer leak in __ext4_read_dirblock() on error path
mount: Retest MNT_LOCKED in do_umount
mount: Don't allow copying MNT_UNBINDABLE|MNT_LOCKED mounts
mount: Prevent MNT_DETACH from disconnecting locked mounts
sunrpc: correct the computation for page_ptr when truncating
rtc: hctosys: Add missing range error reporting
fuse: fix leaked notify reply
configfs: replace strncpy with memcpy
hugetlbfs: fix kernel BUG at fs/hugetlbfs/inode.c:444!
mm: migration: fix migration of huge PMD shared pages
drm/rockchip: Allow driver to be shutdown on reboot/kexec
drm/dp_mst: Check if primary mstb is null
drm/i915/hdmi: Add HDMI 2.0 audio clock recovery N values
Linux 4.4.164
Change-Id: Idf97ca97ab9d11bdee42649d7133b6b9005b13fc
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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Changes in 4.4.148
ext4: fix check to prevent initializing reserved inodes
tpm: fix race condition in tpm_common_write()
ipv4+ipv6: Make INET*_ESP select CRYPTO_ECHAINIV
fork: unconditionally clear stack on fork
parisc: Enable CONFIG_MLONGCALLS by default
parisc: Define mb() and add memory barriers to assembler unlock sequences
xen/netfront: don't cache skb_shinfo()
ACPI / LPSS: Add missing prv_offset setting for byt/cht PWM devices
scsi: sr: Avoid that opening a CD-ROM hangs with runtime power management enabled
root dentries need RCU-delayed freeing
fix mntput/mntput race
fix __legitimize_mnt()/mntput() race
IB/core: Make testing MR flags for writability a static inline function
IB/mlx4: Mark user MR as writable if actual virtual memory is writable
IB/ocrdma: fix out of bounds access to local buffer
ARM: dts: imx6sx: fix irq for pcie bridge
x86/paravirt: Fix spectre-v2 mitigations for paravirt guests
x86/speculation: Protect against userspace-userspace spectreRSB
kprobes/x86: Fix %p uses in error messages
x86/irqflags: Provide a declaration for native_save_fl
x86/speculation/l1tf: Increase 32bit PAE __PHYSICAL_PAGE_SHIFT
x86/mm: Move swap offset/type up in PTE to work around erratum
x86/mm: Fix swap entry comment and macro
mm: x86: move _PAGE_SWP_SOFT_DIRTY from bit 7 to bit 1
x86/speculation/l1tf: Change order of offset/type in swap entry
x86/speculation/l1tf: Protect swap entries against L1TF
x86/speculation/l1tf: Protect PROT_NONE PTEs against speculation
x86/speculation/l1tf: Make sure the first page is always reserved
x86/speculation/l1tf: Add sysfs reporting for l1tf
mm: Add vm_insert_pfn_prot()
mm: fix cache mode tracking in vm_insert_mixed()
x86/speculation/l1tf: Disallow non privileged high MMIO PROT_NONE mappings
x86/speculation/l1tf: Limit swap file size to MAX_PA/2
x86/bugs: Move the l1tf function and define pr_fmt properly
x86/speculation/l1tf: Extend 64bit swap file size limit
x86/cpufeatures: Add detection of L1D cache flush support.
x86/speculation/l1tf: Protect PAE swap entries against L1TF
x86/speculation/l1tf: Fix up pte->pfn conversion for PAE
x86/speculation/l1tf: Invert all not present mappings
x86/speculation/l1tf: Make pmd/pud_mknotpresent() invert
x86/mm/pat: Make set_memory_np() L1TF safe
x86/mm/kmmio: Make the tracer robust against L1TF
x86/speculation/l1tf: Fix up CPU feature flags
x86/init: fix build with CONFIG_SWAP=n
x86/speculation/l1tf: Unbreak !__HAVE_ARCH_PFN_MODIFY_ALLOWED architectures
Linux 4.4.148
Change-Id: Id593840e382389d43e5e54f9d1cfa1d679d8d8be
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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* refs/heads/tmp-564ce1b
Linux 4.4.164
drm/i915/hdmi: Add HDMI 2.0 audio clock recovery N values
drm/dp_mst: Check if primary mstb is null
drm/rockchip: Allow driver to be shutdown on reboot/kexec
mm: migration: fix migration of huge PMD shared pages
hugetlbfs: fix kernel BUG at fs/hugetlbfs/inode.c:444!
configfs: replace strncpy with memcpy
fuse: fix leaked notify reply
rtc: hctosys: Add missing range error reporting
sunrpc: correct the computation for page_ptr when truncating
mount: Prevent MNT_DETACH from disconnecting locked mounts
mount: Don't allow copying MNT_UNBINDABLE|MNT_LOCKED mounts
mount: Retest MNT_LOCKED in do_umount
ext4: fix buffer leak in __ext4_read_dirblock() on error path
ext4: fix buffer leak in ext4_xattr_move_to_block() on error path
ext4: release bs.bh before re-using in ext4_xattr_block_find()
ext4: fix possible leak of sbi->s_group_desc_leak in error path
ext4: avoid possible double brelse() in add_new_gdb() on error path
ext4: fix missing cleanup if ext4_alloc_flex_bg_array() fails while resizing
ext4: avoid buffer leak in ext4_orphan_add() after prior errors
ext4: fix possible inode leak in the retry loop of ext4_resize_fs()
ext4: avoid potential extra brelse in setup_new_flex_group_blocks()
ext4: add missing brelse() add_new_gdb_meta_bg()'s error path
ext4: add missing brelse() in set_flexbg_block_bitmap()'s error path
ext4: add missing brelse() update_backups()'s error path
clockevents/drivers/i8253: Add support for PIT shutdown quirk
Btrfs: fix data corruption due to cloning of eof block
arch/alpha, termios: implement BOTHER, IBSHIFT and termios2
termios, tty/tty_baudrate.c: fix buffer overrun
mtd: docg3: don't set conflicting BCH_CONST_PARAMS option
mm: thp: relax __GFP_THISNODE for MADV_HUGEPAGE mappings
ocfs2: fix a misuse a of brelse after failing ocfs2_check_dir_entry
vhost/scsi: truncate T10 PI iov_iter to prot_bytes
mach64: fix image corruption due to reading accelerator registers
mach64: fix display corruption on big endian machines
libceph: bump CEPH_MSG_MAX_DATA_LEN
clk: s2mps11: Fix matching when built as module and DT node contains compatible
xtensa: fix boot parameters address translation
xtensa: make sure bFLT stack is 16 byte aligned
xtensa: add NOTES section to the linker script
MIPS: Loongson-3: Fix BRIDGE irq delivery problem
MIPS: Loongson-3: Fix CPU UART irq delivery problem
bna: ethtool: Avoid reading past end of buffer
e1000: fix race condition between e1000_down() and e1000_watchdog
e1000: avoid null pointer dereference on invalid stat type
mm: do not bug_on on incorrect length in __mm_populate()
fs, elf: make sure to page align bss in load_elf_library
mm: refuse wrapped vm_brk requests
binfmt_elf: fix calculations for bss padding
mm, elf: handle vm_brk error
fuse: set FR_SENT while locked
fuse: fix blocked_waitq wakeup
fuse: Fix use-after-free in fuse_dev_do_write()
fuse: Fix use-after-free in fuse_dev_do_read()
scsi: qla2xxx: Fix incorrect port speed being set for FC adapters
cdrom: fix improper type cast, which can leat to information leak.
9p: clear dangling pointers in p9stat_free
9p locks: fix glock.client_id leak in do_lock
media: tvp5150: fix width alignment during set_selection()
sc16is7xx: Fix for multi-channel stall
powerpc/boot: Ensure _zimage_start is a weak symbol
MIPS: kexec: Mark CPU offline before disabling local IRQ
media: pci: cx23885: handle adding to list failure
drm/omap: fix memory barrier bug in DMM driver
powerpc/nohash: fix undefined behaviour when testing page size support
tty: check name length in tty_find_polling_driver()
MD: fix invalid stored role for a disk - try2
btrfs: set max_extent_size properly
Btrfs: fix null pointer dereference on compressed write path error
btrfs: qgroup: Dirty all qgroups before rescan
Btrfs: fix wrong dentries after fsync of file that got its parent replaced
btrfs: make sure we create all new block groups
btrfs: reset max_extent_size on clear in a bitmap
btrfs: wait on caching when putting the bg cache
btrfs: don't attempt to trim devices that don't support it
btrfs: iterate all devices during trim, instead of fs_devices::alloc_list
btrfs: locking: Add extra check in btrfs_init_new_buffer() to avoid deadlock
btrfs: Handle owner mismatch gracefully when walking up tree
soc/tegra: pmc: Fix child-node lookup
arm64: dts: stratix10: Correct System Manager register size
Cramfs: fix abad comparison when wrap-arounds occur
ext4: avoid running out of journal credits when appending to an inline file
media: em28xx: make v4l2-compliance happier by starting sequence on zero
media: em28xx: fix input name for Terratec AV 350
media: em28xx: use a default format if TRY_FMT fails
xen: fix xen_qlock_wait()
kgdboc: Passing ekgdboc to command line causes panic
TC: Set DMA masks for devices
MIPS: OCTEON: fix out of bounds array access on CN68XX
powerpc/msi: Fix compile error on mpc83xx
dm ioctl: harden copy_params()'s copy_from_user() from malicious users
lockd: fix access beyond unterminated strings in prints
nfsd: Fix an Oops in free_session()
NFSv4.1: Fix the r/wsize checking
genirq: Fix race on spurious interrupt detection
printk: Fix panic caused by passing log_buf_len to command line
smb3: on kerberos mount if server doesn't specify auth type use krb5
smb3: do not attempt cifs operation in smb3 query info error path
smb3: allow stats which track session and share reconnects to be reset
w1: omap-hdq: fix missing bus unregister at removal
iio: adc: at91: fix wrong channel number in triggered buffer mode
iio: adc: at91: fix acking DRDY irq on simple conversions
kbuild: fix kernel/bounds.c 'W=1' warning
hugetlbfs: dirty pages as they are added to pagecache
ima: fix showing large 'violations' or 'runtime_measurements_count'
crypto: lrw - Fix out-of bounds access on counter overflow
signal/GenWQE: Fix sending of SIGKILL
PCI: Add Device IDs for Intel GPU "spurious interrupt" quirk
HID: hiddev: fix potential Spectre v1
ext4: initialize retries variable in ext4_da_write_inline_data_begin()
gfs2_meta: ->mount() can get NULL dev_name
jbd2: fix use after free in jbd2_log_do_checkpoint()
libnvdimm: Hold reference on parent while scheduling async init
net/ipv4: defensive cipso option parsing
xen: make xen_qlock_wait() nestable
xen: fix race in xen_qlock_wait()
tpm: Restore functionality to xen vtpm driver.
xen-swiotlb: use actually allocated size on check physical continuous
ALSA: hda: Check the non-cached stream buffers more explicitly
dmaengine: dma-jz4780: Return error if not probed from DT
signal: Always deliver the kernel's SIGKILL and SIGSTOP to a pid namespace init
scsi: lpfc: Correct soft lockup when running mds diagnostics
uio: ensure class is registered before devices
driver/dma/ioat: Call del_timer_sync() without holding prep_lock
usb: chipidea: Prevent unbalanced IRQ disable
MD: fix invalid stored role for a disk
ext4: fix argument checking in EXT4_IOC_MOVE_EXT
tpm: suppress transmit cmd error logs when TPM 1.2 is disabled/deactivated
scsi: megaraid_sas: fix a missing-check bug
scsi: esp_scsi: Track residual for PIO transfers
ath10k: schedule hardware restart if WMI command times out
pinctrl: ssbi-gpio: Fix pm8xxx_pin_config_get() to be compliant
pinctrl: spmi-mpp: Fix pmic_mpp_config_get() to be compliant
pinctrl: qcom: spmi-mpp: Fix drive strength setting
ACPI / LPSS: Add alternative ACPI HIDs for Cherry Trail DMA controllers
kprobes: Return error if we fail to reuse kprobe instead of BUG_ON()
pinctrl: qcom: spmi-mpp: Fix err handling of pmic_mpp_set_mux
x86: boot: Fix EFI stub alignment
Bluetooth: btbcm: Add entry for BCM4335C0 UART bluetooth
mmc: sdhci-pci-o2micro: Add quirk for O2 Micro dev 0x8620 rev 0x01
perf tools: Cleanup trace-event-info 'tdata' leak
perf tools: Free temporary 'sys' string in read_event_files()
tun: Consistently configure generic netdev params via rtnetlink
swim: fix cleanup on setup error
ataflop: fix error handling during setup
locking/lockdep: Fix debug_locks off performance problem
selftests: ftrace: Add synthetic event syntax testcase
net: qla3xxx: Remove overflowing shift statement
x86/fpu: Remove second definition of fpu in __fpu__restore_sig()
sparc: Fix single-pcr perf event counter management.
x86/kconfig: Fall back to ticket spinlocks
x86/corruption-check: Fix panic in memory_corruption_check() when boot option without value is provided
ALSA: ca0106: Disable IZD on SB0570 DAC to fix audio pops
ALSA: hda - Add mic quirk for the Lenovo G50-30 (17aa:3905)
parisc: Fix map_pages() to not overwrite existing pte entries
parisc: Fix address in HPMC IVA
ipmi: Fix timer race with module unload
pcmcia: Implement CLKRUN protocol disabling for Ricoh bridges
jffs2: free jffs2_sb_info through jffs2_kill_sb()
hwmon: (pmbus) Fix page count auto-detection.
bcache: fix miss key refill->end in writeback
ANDROID: zram: set comp_len to PAGE_SIZE when page is huge
Conflicts:
drivers/hid/usbhid/hiddev.c
Change-Id: I42874613e3b4102ef4ed051e1e8ed25b2d4ae7f2
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>
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Changes in 4.4.164
bcache: fix miss key refill->end in writeback
hwmon: (pmbus) Fix page count auto-detection.
jffs2: free jffs2_sb_info through jffs2_kill_sb()
pcmcia: Implement CLKRUN protocol disabling for Ricoh bridges
ipmi: Fix timer race with module unload
parisc: Fix address in HPMC IVA
parisc: Fix map_pages() to not overwrite existing pte entries
ALSA: hda - Add mic quirk for the Lenovo G50-30 (17aa:3905)
ALSA: ca0106: Disable IZD on SB0570 DAC to fix audio pops
x86/corruption-check: Fix panic in memory_corruption_check() when boot option without value is provided
x86/kconfig: Fall back to ticket spinlocks
sparc: Fix single-pcr perf event counter management.
x86/fpu: Remove second definition of fpu in __fpu__restore_sig()
net: qla3xxx: Remove overflowing shift statement
selftests: ftrace: Add synthetic event syntax testcase
locking/lockdep: Fix debug_locks off performance problem
ataflop: fix error handling during setup
swim: fix cleanup on setup error
tun: Consistently configure generic netdev params via rtnetlink
perf tools: Free temporary 'sys' string in read_event_files()
perf tools: Cleanup trace-event-info 'tdata' leak
mmc: sdhci-pci-o2micro: Add quirk for O2 Micro dev 0x8620 rev 0x01
Bluetooth: btbcm: Add entry for BCM4335C0 UART bluetooth
x86: boot: Fix EFI stub alignment
pinctrl: qcom: spmi-mpp: Fix err handling of pmic_mpp_set_mux
kprobes: Return error if we fail to reuse kprobe instead of BUG_ON()
ACPI / LPSS: Add alternative ACPI HIDs for Cherry Trail DMA controllers
pinctrl: qcom: spmi-mpp: Fix drive strength setting
pinctrl: spmi-mpp: Fix pmic_mpp_config_get() to be compliant
pinctrl: ssbi-gpio: Fix pm8xxx_pin_config_get() to be compliant
ath10k: schedule hardware restart if WMI command times out
scsi: esp_scsi: Track residual for PIO transfers
scsi: megaraid_sas: fix a missing-check bug
tpm: suppress transmit cmd error logs when TPM 1.2 is disabled/deactivated
ext4: fix argument checking in EXT4_IOC_MOVE_EXT
MD: fix invalid stored role for a disk
usb: chipidea: Prevent unbalanced IRQ disable
driver/dma/ioat: Call del_timer_sync() without holding prep_lock
uio: ensure class is registered before devices
scsi: lpfc: Correct soft lockup when running mds diagnostics
signal: Always deliver the kernel's SIGKILL and SIGSTOP to a pid namespace init
dmaengine: dma-jz4780: Return error if not probed from DT
ALSA: hda: Check the non-cached stream buffers more explicitly
xen-swiotlb: use actually allocated size on check physical continuous
tpm: Restore functionality to xen vtpm driver.
xen: fix race in xen_qlock_wait()
xen: make xen_qlock_wait() nestable
net/ipv4: defensive cipso option parsing
libnvdimm: Hold reference on parent while scheduling async init
jbd2: fix use after free in jbd2_log_do_checkpoint()
gfs2_meta: ->mount() can get NULL dev_name
ext4: initialize retries variable in ext4_da_write_inline_data_begin()
HID: hiddev: fix potential Spectre v1
PCI: Add Device IDs for Intel GPU "spurious interrupt" quirk
signal/GenWQE: Fix sending of SIGKILL
crypto: lrw - Fix out-of bounds access on counter overflow
ima: fix showing large 'violations' or 'runtime_measurements_count'
hugetlbfs: dirty pages as they are added to pagecache
kbuild: fix kernel/bounds.c 'W=1' warning
iio: adc: at91: fix acking DRDY irq on simple conversions
iio: adc: at91: fix wrong channel number in triggered buffer mode
w1: omap-hdq: fix missing bus unregister at removal
smb3: allow stats which track session and share reconnects to be reset
smb3: do not attempt cifs operation in smb3 query info error path
smb3: on kerberos mount if server doesn't specify auth type use krb5
printk: Fix panic caused by passing log_buf_len to command line
genirq: Fix race on spurious interrupt detection
NFSv4.1: Fix the r/wsize checking
nfsd: Fix an Oops in free_session()
lockd: fix access beyond unterminated strings in prints
dm ioctl: harden copy_params()'s copy_from_user() from malicious users
powerpc/msi: Fix compile error on mpc83xx
MIPS: OCTEON: fix out of bounds array access on CN68XX
TC: Set DMA masks for devices
kgdboc: Passing ekgdboc to command line causes panic
xen: fix xen_qlock_wait()
media: em28xx: use a default format if TRY_FMT fails
media: em28xx: fix input name for Terratec AV 350
media: em28xx: make v4l2-compliance happier by starting sequence on zero
ext4: avoid running out of journal credits when appending to an inline file
Cramfs: fix abad comparison when wrap-arounds occur
arm64: dts: stratix10: Correct System Manager register size
soc/tegra: pmc: Fix child-node lookup
btrfs: Handle owner mismatch gracefully when walking up tree
btrfs: locking: Add extra check in btrfs_init_new_buffer() to avoid deadlock
btrfs: iterate all devices during trim, instead of fs_devices::alloc_list
btrfs: don't attempt to trim devices that don't support it
btrfs: wait on caching when putting the bg cache
btrfs: reset max_extent_size on clear in a bitmap
btrfs: make sure we create all new block groups
Btrfs: fix wrong dentries after fsync of file that got its parent replaced
btrfs: qgroup: Dirty all qgroups before rescan
Btrfs: fix null pointer dereference on compressed write path error
btrfs: set max_extent_size properly
MD: fix invalid stored role for a disk - try2
tty: check name length in tty_find_polling_driver()
powerpc/nohash: fix undefined behaviour when testing page size support
drm/omap: fix memory barrier bug in DMM driver
media: pci: cx23885: handle adding to list failure
MIPS: kexec: Mark CPU offline before disabling local IRQ
powerpc/boot: Ensure _zimage_start is a weak symbol
sc16is7xx: Fix for multi-channel stall
media: tvp5150: fix width alignment during set_selection()
9p locks: fix glock.client_id leak in do_lock
9p: clear dangling pointers in p9stat_free
cdrom: fix improper type cast, which can leat to information leak.
scsi: qla2xxx: Fix incorrect port speed being set for FC adapters
fuse: Fix use-after-free in fuse_dev_do_read()
fuse: Fix use-after-free in fuse_dev_do_write()
fuse: fix blocked_waitq wakeup
fuse: set FR_SENT while locked
mm, elf: handle vm_brk error
binfmt_elf: fix calculations for bss padding
mm: refuse wrapped vm_brk requests
fs, elf: make sure to page align bss in load_elf_library
mm: do not bug_on on incorrect length in __mm_populate()
e1000: avoid null pointer dereference on invalid stat type
e1000: fix race condition between e1000_down() and e1000_watchdog
bna: ethtool: Avoid reading past end of buffer
MIPS: Loongson-3: Fix CPU UART irq delivery problem
MIPS: Loongson-3: Fix BRIDGE irq delivery problem
xtensa: add NOTES section to the linker script
xtensa: make sure bFLT stack is 16 byte aligned
xtensa: fix boot parameters address translation
clk: s2mps11: Fix matching when built as module and DT node contains compatible
libceph: bump CEPH_MSG_MAX_DATA_LEN
mach64: fix display corruption on big endian machines
mach64: fix image corruption due to reading accelerator registers
vhost/scsi: truncate T10 PI iov_iter to prot_bytes
ocfs2: fix a misuse a of brelse after failing ocfs2_check_dir_entry
mm: thp: relax __GFP_THISNODE for MADV_HUGEPAGE mappings
mtd: docg3: don't set conflicting BCH_CONST_PARAMS option
termios, tty/tty_baudrate.c: fix buffer overrun
arch/alpha, termios: implement BOTHER, IBSHIFT and termios2
Btrfs: fix data corruption due to cloning of eof block
clockevents/drivers/i8253: Add support for PIT shutdown quirk
ext4: add missing brelse() update_backups()'s error path
ext4: add missing brelse() in set_flexbg_block_bitmap()'s error path
ext4: add missing brelse() add_new_gdb_meta_bg()'s error path
ext4: avoid potential extra brelse in setup_new_flex_group_blocks()
ext4: fix possible inode leak in the retry loop of ext4_resize_fs()
ext4: avoid buffer leak in ext4_orphan_add() after prior errors
ext4: fix missing cleanup if ext4_alloc_flex_bg_array() fails while resizing
ext4: avoid possible double brelse() in add_new_gdb() on error path
ext4: fix possible leak of sbi->s_group_desc_leak in error path
ext4: release bs.bh before re-using in ext4_xattr_block_find()
ext4: fix buffer leak in ext4_xattr_move_to_block() on error path
ext4: fix buffer leak in __ext4_read_dirblock() on error path
mount: Retest MNT_LOCKED in do_umount
mount: Don't allow copying MNT_UNBINDABLE|MNT_LOCKED mounts
mount: Prevent MNT_DETACH from disconnecting locked mounts
sunrpc: correct the computation for page_ptr when truncating
rtc: hctosys: Add missing range error reporting
fuse: fix leaked notify reply
configfs: replace strncpy with memcpy
hugetlbfs: fix kernel BUG at fs/hugetlbfs/inode.c:444!
mm: migration: fix migration of huge PMD shared pages
drm/rockchip: Allow driver to be shutdown on reboot/kexec
drm/dp_mst: Check if primary mstb is null
drm/i915/hdmi: Add HDMI 2.0 audio clock recovery N values
Linux 4.4.164
Change-Id: I55f9e5e33efd8c8ae2609d2393696c810f49f33e
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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commit 9c8e0a1b683525464a2abe9fb4b54404a50ed2b4 upstream.
Timothy Baldwin <timbaldwin@fastmail.co.uk> wrote:
> As per mount_namespaces(7) unprivileged users should not be able to look under mount points:
>
> Mounts that come as a single unit from more privileged mount are locked
> together and may not be separated in a less privileged mount namespace.
>
> However they can:
>
> 1. Create a mount namespace.
> 2. In the mount namespace open a file descriptor to the parent of a mount point.
> 3. Destroy the mount namespace.
> 4. Use the file descriptor to look under the mount point.
>
> I have reproduced this with Linux 4.16.18 and Linux 4.18-rc8.
>
> The setup:
>
> $ sudo sysctl kernel.unprivileged_userns_clone=1
> kernel.unprivileged_userns_clone = 1
> $ mkdir -p A/B/Secret
> $ sudo mount -t tmpfs hide A/B
>
>
> "Secret" is indeed hidden as expected:
>
> $ ls -lR A
> A:
> total 0
> drwxrwxrwt 2 root root 40 Feb 12 21:08 B
>
> A/B:
> total 0
>
>
> The attack revealing "Secret":
>
> $ unshare -Umr sh -c "exec unshare -m ls -lR /proc/self/fd/4/ 4<A"
> /proc/self/fd/4/:
> total 0
> drwxr-xr-x 3 root root 60 Feb 12 21:08 B
>
> /proc/self/fd/4/B:
> total 0
> drwxr-xr-x 2 root root 40 Feb 12 21:08 Secret
>
> /proc/self/fd/4/B/Secret:
> total 0
I tracked this down to put_mnt_ns running passing UMOUNT_SYNC and
disconnecting all of the mounts in a mount namespace. Fix this by
factoring drop_mounts out of drop_collected_mounts and passing
0 instead of UMOUNT_SYNC.
There are two possible behavior differences that result from this.
- No longer setting UMOUNT_SYNC will no longer set MNT_SYNC_UMOUNT on
the vfsmounts being unmounted. This effects the lazy rcu walk by
kicking the walk out of rcu mode and forcing it to be a non-lazy
walk.
- No longer disconnecting locked mounts will keep some mounts around
longer as they stay because the are locked to other mounts.
There are only two users of drop_collected mounts: audit_tree.c and
put_mnt_ns.
In audit_tree.c the mounts are private and there are no rcu lazy walks
only calls to iterate_mounts. So the changes should have no effect
except for a small timing effect as the connected mounts are disconnected.
In put_mnt_ns there may be references from process outside the mount
namespace to the mounts. So the mounts remaining connected will
be the bug fix that is needed. That rcu walks are allowed to continue
appears not to be a problem especially as the rcu walk change was about
an implementation detail not about semantics.
Cc: stable@vger.kernel.org
Fixes: 5ff9d8a65ce8 ("vfs: Lock in place mounts from more privileged users")
Reported-by: Timothy Baldwin <timbaldwin@fastmail.co.uk>
Tested-by: Timothy Baldwin <timbaldwin@fastmail.co.uk>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit df7342b240185d58d3d9665c0bbf0a0f5570ec29 upstream.
Jonathan Calmels from NVIDIA reported that he's able to bypass the
mount visibility security check in place in the Linux kernel by using
a combination of the unbindable property along with the private mount
propagation option to allow a unprivileged user to see a path which
was purposefully hidden by the root user.
Reproducer:
# Hide a path to all users using a tmpfs
root@castiana:~# mount -t tmpfs tmpfs /sys/devices/
root@castiana:~#
# As an unprivileged user, unshare user namespace and mount namespace
stgraber@castiana:~$ unshare -U -m -r
# Confirm the path is still not accessible
root@castiana:~# ls /sys/devices/
# Make /sys recursively unbindable and private
root@castiana:~# mount --make-runbindable /sys
root@castiana:~# mount --make-private /sys
# Recursively bind-mount the rest of /sys over to /mnnt
root@castiana:~# mount --rbind /sys/ /mnt
# Access our hidden /sys/device as an unprivileged user
root@castiana:~# ls /mnt/devices/
breakpoint cpu cstate_core cstate_pkg i915 intel_pt isa kprobe
LNXSYSTM:00 msr pci0000:00 platform pnp0 power software system
tracepoint uncore_arb uncore_cbox_0 uncore_cbox_1 uprobe virtual
Solve this by teaching copy_tree to fail if a mount turns out to be
both unbindable and locked.
Cc: stable@vger.kernel.org
Fixes: 5ff9d8a65ce8 ("vfs: Lock in place mounts from more privileged users")
Reported-by: Jonathan Calmels <jcalmels@nvidia.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 25d202ed820ee347edec0bf3bf553544556bf64b upstream.
It was recently pointed out that the one instance of testing MNT_LOCKED
outside of the namespace_sem is in ksys_umount.
Fix that by adding a test inside of do_umount with namespace_sem and
the mount_lock held. As it helps to fail fails the existing test is
maintained with an additional comment pointing out that it may be racy
because the locks are not held.
Cc: stable@vger.kernel.org
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Fixes: 5ff9d8a65ce8 ("vfs: Lock in place mounts from more privileged users")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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* refs/heads/tmp-f057ff9
Linux 4.4.148
x86/speculation/l1tf: Unbreak !__HAVE_ARCH_PFN_MODIFY_ALLOWED architectures
x86/init: fix build with CONFIG_SWAP=n
x86/speculation/l1tf: Fix up CPU feature flags
x86/mm/kmmio: Make the tracer robust against L1TF
x86/mm/pat: Make set_memory_np() L1TF safe
x86/speculation/l1tf: Make pmd/pud_mknotpresent() invert
x86/speculation/l1tf: Invert all not present mappings
x86/speculation/l1tf: Fix up pte->pfn conversion for PAE
x86/speculation/l1tf: Protect PAE swap entries against L1TF
x86/cpufeatures: Add detection of L1D cache flush support.
x86/speculation/l1tf: Extend 64bit swap file size limit
x86/bugs: Move the l1tf function and define pr_fmt properly
x86/speculation/l1tf: Limit swap file size to MAX_PA/2
x86/speculation/l1tf: Disallow non privileged high MMIO PROT_NONE mappings
mm: fix cache mode tracking in vm_insert_mixed()
mm: Add vm_insert_pfn_prot()
x86/speculation/l1tf: Add sysfs reporting for l1tf
x86/speculation/l1tf: Make sure the first page is always reserved
x86/speculation/l1tf: Protect PROT_NONE PTEs against speculation
x86/speculation/l1tf: Protect swap entries against L1TF
x86/speculation/l1tf: Change order of offset/type in swap entry
mm: x86: move _PAGE_SWP_SOFT_DIRTY from bit 7 to bit 1
x86/mm: Fix swap entry comment and macro
x86/mm: Move swap offset/type up in PTE to work around erratum
x86/speculation/l1tf: Increase 32bit PAE __PHYSICAL_PAGE_SHIFT
x86/irqflags: Provide a declaration for native_save_fl
kprobes/x86: Fix %p uses in error messages
x86/speculation: Protect against userspace-userspace spectreRSB
x86/paravirt: Fix spectre-v2 mitigations for paravirt guests
ARM: dts: imx6sx: fix irq for pcie bridge
IB/ocrdma: fix out of bounds access to local buffer
IB/mlx4: Mark user MR as writable if actual virtual memory is writable
IB/core: Make testing MR flags for writability a static inline function
fix __legitimize_mnt()/mntput() race
fix mntput/mntput race
root dentries need RCU-delayed freeing
scsi: sr: Avoid that opening a CD-ROM hangs with runtime power management enabled
ACPI / LPSS: Add missing prv_offset setting for byt/cht PWM devices
xen/netfront: don't cache skb_shinfo()
parisc: Define mb() and add memory barriers to assembler unlock sequences
parisc: Enable CONFIG_MLONGCALLS by default
fork: unconditionally clear stack on fork
ipv4+ipv6: Make INET*_ESP select CRYPTO_ECHAINIV
tpm: fix race condition in tpm_common_write()
ext4: fix check to prevent initializing reserved inodes
Linux 4.4.147
jfs: Fix inconsistency between memory allocation and ea_buf->max_size
i2c: imx: Fix reinit_completion() use
ring_buffer: tracing: Inherit the tracing setting to next ring buffer
ACPI / PCI: Bail early in acpi_pci_add_bus() if there is no ACPI handle
ext4: fix false negatives *and* false positives in ext4_check_descriptors()
netlink: Don't shift on 64 for ngroups
netlink: Don't shift with UB on nlk->ngroups
netlink: Do not subscribe to non-existent groups
nohz: Fix local_timer_softirq_pending()
genirq: Make force irq threading setup more robust
scsi: qla2xxx: Return error when TMF returns
scsi: qla2xxx: Fix ISP recovery on unload
Conflicts:
include/linux/swapfile.h
Removed CONFIG_CRYPTO_ECHAINIV from defconfig files since this upmerge is
adding this config to Kconfig file.
Change-Id: Ide96c29f919d76590c2bdccf356d1d464a892fd7
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>
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Changes in 4.4.148
ext4: fix check to prevent initializing reserved inodes
tpm: fix race condition in tpm_common_write()
ipv4+ipv6: Make INET*_ESP select CRYPTO_ECHAINIV
fork: unconditionally clear stack on fork
parisc: Enable CONFIG_MLONGCALLS by default
parisc: Define mb() and add memory barriers to assembler unlock sequences
xen/netfront: don't cache skb_shinfo()
ACPI / LPSS: Add missing prv_offset setting for byt/cht PWM devices
scsi: sr: Avoid that opening a CD-ROM hangs with runtime power management enabled
root dentries need RCU-delayed freeing
fix mntput/mntput race
fix __legitimize_mnt()/mntput() race
IB/core: Make testing MR flags for writability a static inline function
IB/mlx4: Mark user MR as writable if actual virtual memory is writable
IB/ocrdma: fix out of bounds access to local buffer
ARM: dts: imx6sx: fix irq for pcie bridge
x86/paravirt: Fix spectre-v2 mitigations for paravirt guests
x86/speculation: Protect against userspace-userspace spectreRSB
kprobes/x86: Fix %p uses in error messages
x86/irqflags: Provide a declaration for native_save_fl
x86/speculation/l1tf: Increase 32bit PAE __PHYSICAL_PAGE_SHIFT
x86/mm: Move swap offset/type up in PTE to work around erratum
x86/mm: Fix swap entry comment and macro
mm: x86: move _PAGE_SWP_SOFT_DIRTY from bit 7 to bit 1
x86/speculation/l1tf: Change order of offset/type in swap entry
x86/speculation/l1tf: Protect swap entries against L1TF
x86/speculation/l1tf: Protect PROT_NONE PTEs against speculation
x86/speculation/l1tf: Make sure the first page is always reserved
x86/speculation/l1tf: Add sysfs reporting for l1tf
mm: Add vm_insert_pfn_prot()
mm: fix cache mode tracking in vm_insert_mixed()
x86/speculation/l1tf: Disallow non privileged high MMIO PROT_NONE mappings
x86/speculation/l1tf: Limit swap file size to MAX_PA/2
x86/bugs: Move the l1tf function and define pr_fmt properly
x86/speculation/l1tf: Extend 64bit swap file size limit
x86/cpufeatures: Add detection of L1D cache flush support.
x86/speculation/l1tf: Protect PAE swap entries against L1TF
x86/speculation/l1tf: Fix up pte->pfn conversion for PAE
x86/speculation/l1tf: Invert all not present mappings
x86/speculation/l1tf: Make pmd/pud_mknotpresent() invert
x86/mm/pat: Make set_memory_np() L1TF safe
x86/mm/kmmio: Make the tracer robust against L1TF
x86/speculation/l1tf: Fix up CPU feature flags
x86/init: fix build with CONFIG_SWAP=n
x86/speculation/l1tf: Unbreak !__HAVE_ARCH_PFN_MODIFY_ALLOWED architectures
Linux 4.4.148
Change-Id: I83c857d9d9d74ee47e61d15eb411f276f057ba3d
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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commit 119e1ef80ecfe0d1deb6378d4ab41f5b71519de1 upstream.
__legitimize_mnt() has two problems - one is that in case of success
the check of mount_lock is not ordered wrt preceding increment of
refcount, making it possible to have successful __legitimize_mnt()
on one CPU just before the otherwise final mntpu() on another,
with __legitimize_mnt() not seeing mntput() taking the lock and
mntput() not seeing the increment done by __legitimize_mnt().
Solved by a pair of barriers.
Another is that failure of __legitimize_mnt() on the second
read_seqretry() leaves us with reference that'll need to be
dropped by caller; however, if that races with final mntput()
we can end up with caller dropping rcu_read_lock() and doing
mntput() to release that reference - with the first mntput()
having freed the damn thing just as rcu_read_lock() had been
dropped. Solution: in "do mntput() yourself" failure case
grab mount_lock, check if MNT_DOOMED has been set by racing
final mntput() that has missed our increment and if it has -
undo the increment and treat that as "failure, caller doesn't
need to drop anything" case.
It's not easy to hit - the final mntput() has to come right
after the first read_seqretry() in __legitimize_mnt() *and*
manage to miss the increment done by __legitimize_mnt() before
the second read_seqretry() in there. The things that are almost
impossible to hit on bare hardware are not impossible on SMP
KVM, though...
Reported-by: Oleg Nesterov <oleg@redhat.com>
Fixes: 48a066e72d97 ("RCU'd vsfmounts")
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 9ea0a46ca2c318fcc449c1e6b62a7230a17888f1 upstream.
mntput_no_expire() does the calculation of total refcount under mount_lock;
unfortunately, the decrement (as well as all increments) are done outside
of it, leading to false positives in the "are we dropping the last reference"
test. Consider the following situation:
* mnt is a lazy-umounted mount, kept alive by two opened files. One
of those files gets closed. Total refcount of mnt is 2. On CPU 42
mntput(mnt) (called from __fput()) drops one reference, decrementing component
* After it has looked at component #0, the process on CPU 0 does
mntget(), incrementing component #0, gets preempted and gets to run again -
on CPU 69. There it does mntput(), which drops the reference (component #69)
and proceeds to spin on mount_lock.
* On CPU 42 our first mntput() finishes counting. It observes the
decrement of component #69, but not the increment of component #0. As the
result, the total it gets is not 1 as it should've been - it's 0. At which
point we decide that vfsmount needs to be killed and proceed to free it and
shut the filesystem down. However, there's still another opened file
on that filesystem, with reference to (now freed) vfsmount, etc. and we are
screwed.
It's not a wide race, but it can be reproduced with artificial slowdown of
the mnt_get_count() loop, and it should be easier to hit on SMP KVM setups.
Fix consists of moving the refcount decrement under mount_lock; the tricky
part is that we want (and can) keep the fast case (i.e. mount that still
has non-NULL ->mnt_ns) entirely out of mount_lock. All places that zero
mnt->mnt_ns are dropping some reference to mnt and they call synchronize_rcu()
before that mntput(). IOW, if mntput() observes (under rcu_read_lock())
a non-NULL ->mnt_ns, it is guaranteed that there is another reference yet to
be dropped.
Reported-by: Jann Horn <jannh@google.com>
Tested-by: Jann Horn <jannh@google.com>
Fixes: 48a066e72d97 ("RCU'd vsfmounts")
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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* refs/heads/tmp-b1c4836
Linux 4.4.129
writeback: safer lock nesting
fanotify: fix logic of events on child
ext4: bugfix for mmaped pages in mpage_release_unused_pages()
mm/filemap.c: fix NULL pointer in page_cache_tree_insert()
mm: allow GFP_{FS,IO} for page_cache_read page cache allocation
autofs: mount point create should honour passed in mode
Don't leak MNT_INTERNAL away from internal mounts
rpc_pipefs: fix double-dput()
hypfs_kill_super(): deal with failed allocations
jffs2_kill_sb(): deal with failed allocations
powerpc/lib: Fix off-by-one in alternate feature patching
powerpc/eeh: Fix enabling bridge MMIO windows
MIPS: memset.S: Fix clobber of v1 in last_fixup
MIPS: memset.S: Fix return of __clear_user from Lpartial_fixup
MIPS: memset.S: EVA & fault support for small_memset
MIPS: uaccess: Add micromips clobbers to bzero invocation
HID: hidraw: Fix crash on HIDIOCGFEATURE with a destroyed device
ALSA: hda - New VIA controller suppor no-snoop path
ALSA: rawmidi: Fix missing input substream checks in compat ioctls
ALSA: line6: Use correct endpoint type for midi output
ext4: fix deadlock between inline_data and ext4_expand_extra_isize_ea()
ext4: fix crashes in dioread_nolock mode
drm/radeon: Fix PCIe lane width calculation
ext4: don't allow r/w mounts if metadata blocks overlap the superblock
vfio/pci: Virtualize Maximum Read Request Size
vfio/pci: Virtualize Maximum Payload Size
vfio-pci: Virtualize PCIe & AF FLR
ALSA: pcm: Fix endless loop for XRUN recovery in OSS emulation
ALSA: pcm: Fix mutex unbalance in OSS emulation ioctls
ALSA: pcm: Return -EBUSY for OSS ioctls changing busy streams
ALSA: pcm: Avoid potential races between OSS ioctls and read/write
ALSA: pcm: Use ERESTARTSYS instead of EINTR in OSS emulation
ALSA: oss: consolidate kmalloc/memset 0 call to kzalloc
watchdog: f71808e_wdt: Fix WD_EN register read
thermal: imx: Fix race condition in imx_thermal_probe()
clk: bcm2835: De-assert/assert PLL reset signal when appropriate
clk: mvebu: armada-38x: add support for missing clocks
clk: mvebu: armada-38x: add support for 1866MHz variants
mmc: jz4740: Fix race condition in IRQ mask update
iommu/vt-d: Fix a potential memory leak
um: Use POSIX ucontext_t instead of struct ucontext
dmaengine: at_xdmac: fix rare residue corruption
IB/srp: Fix completion vector assignment algorithm
IB/srp: Fix srp_abort()
ALSA: pcm: Fix UAF at PCM release via PCM timer access
RDMA/ucma: Don't allow setting RDMA_OPTION_IB_PATH without an RDMA device
ext4: fail ext4_iget for root directory if unallocated
ext4: don't update checksum of new initialized bitmaps
jbd2: if the journal is aborted then don't allow update of the log tail
random: use a tighter cap in credit_entropy_bits_safe()
thunderbolt: Resume control channel after hibernation image is created
ASoC: ssm2602: Replace reg_default_raw with reg_default
HID: core: Fix size as type u32
HID: Fix hid_report_len usage
powerpc/powernv: Fix OPAL NVRAM driver OPAL_BUSY loops
powerpc/powernv: define a standard delay for OPAL_BUSY type retry loops
powerpc/64: Fix smp_wmb barrier definition use use lwsync consistently
powerpc/powernv: Handle unknown OPAL errors in opal_nvram_write()
HID: i2c-hid: fix size check and type usage
usb: dwc3: pci: Properly cleanup resource
USB:fix USB3 devices behind USB3 hubs not resuming at hibernate thaw
ACPI / hotplug / PCI: Check presence of slot itself in get_slot_status()
ACPI / video: Add quirk to force acpi-video backlight on Samsung 670Z5E
regmap: Fix reversed bounds check in regmap_raw_write()
xen-netfront: Fix hang on device removal
ARM: dts: at91: sama5d4: fix pinctrl compatible string
ARM: dts: at91: at91sam9g25: fix mux-mask pinctrl property
usb: musb: gadget: misplaced out of bounds check
mm, slab: reschedule cache_reap() on the same CPU
ipc/shm: fix use-after-free of shm file via remap_file_pages()
resource: fix integer overflow at reallocation
fs/reiserfs/journal.c: add missing resierfs_warning() arg
ubi: Reject MLC NAND
ubi: Fix error for write access
ubi: fastmap: Don't flush fastmap work on detach
ubifs: Check ubifs_wbuf_sync() return code
tty: make n_tty_read() always abort if hangup is in progress
x86/hweight: Don't clobber %rdi
x86/hweight: Get rid of the special calling convention
lan78xx: Correctly indicate invalid OTP
slip: Check if rstate is initialized before uncompressing
cdc_ether: flag the Cinterion AHS8 modem by gemalto as WWAN
hwmon: (ina2xx) Fix access to uninitialized mutex
rtl8187: Fix NULL pointer dereference in priv->conf_mutex
getname_kernel() needs to make sure that ->name != ->iname in long case
s390/ipl: ensure loadparm valid flag is set
s390/qdio: don't merge ERROR output buffers
s390/qdio: don't retry EQBS after CCQ 96
block/loop: fix deadlock after loop_set_status
Revert "perf tests: Decompress kernel module before objdump"
radeon: hide pointless #warning when compile testing
perf intel-pt: Fix timestamp following overflow
perf intel-pt: Fix error recovery from missing TIP packet
perf intel-pt: Fix sync_switch
perf intel-pt: Fix overlap detection to identify consecutive buffers correctly
parisc: Fix out of array access in match_pci_device()
media: v4l2-compat-ioctl32: don't oops on overlay
f2fs: check cap_resource only for data blocks
Revert "f2fs: introduce f2fs_set_page_dirty_nobuffer"
f2fs: clear PageError on writepage
UPSTREAM: timer: Export destroy_hrtimer_on_stack()
BACKPORT: dm verity: add 'check_at_most_once' option to only validate hashes once
f2fs: call unlock_new_inode() before d_instantiate()
f2fs: refactor read path to allow multiple postprocessing steps
fscrypt: allow synchronous bio decryption
Change-Id: I45f4ac10734d92023b53118d83dcd6c83974a283
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>
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Changes in 4.4.129
media: v4l2-compat-ioctl32: don't oops on overlay
parisc: Fix out of array access in match_pci_device()
perf intel-pt: Fix overlap detection to identify consecutive buffers correctly
perf intel-pt: Fix sync_switch
perf intel-pt: Fix error recovery from missing TIP packet
perf intel-pt: Fix timestamp following overflow
radeon: hide pointless #warning when compile testing
Revert "perf tests: Decompress kernel module before objdump"
block/loop: fix deadlock after loop_set_status
s390/qdio: don't retry EQBS after CCQ 96
s390/qdio: don't merge ERROR output buffers
s390/ipl: ensure loadparm valid flag is set
getname_kernel() needs to make sure that ->name != ->iname in long case
rtl8187: Fix NULL pointer dereference in priv->conf_mutex
hwmon: (ina2xx) Fix access to uninitialized mutex
cdc_ether: flag the Cinterion AHS8 modem by gemalto as WWAN
slip: Check if rstate is initialized before uncompressing
lan78xx: Correctly indicate invalid OTP
x86/hweight: Get rid of the special calling convention
x86/hweight: Don't clobber %rdi
tty: make n_tty_read() always abort if hangup is in progress
ubifs: Check ubifs_wbuf_sync() return code
ubi: fastmap: Don't flush fastmap work on detach
ubi: Fix error for write access
ubi: Reject MLC NAND
fs/reiserfs/journal.c: add missing resierfs_warning() arg
resource: fix integer overflow at reallocation
ipc/shm: fix use-after-free of shm file via remap_file_pages()
mm, slab: reschedule cache_reap() on the same CPU
usb: musb: gadget: misplaced out of bounds check
ARM: dts: at91: at91sam9g25: fix mux-mask pinctrl property
ARM: dts: at91: sama5d4: fix pinctrl compatible string
xen-netfront: Fix hang on device removal
regmap: Fix reversed bounds check in regmap_raw_write()
ACPI / video: Add quirk to force acpi-video backlight on Samsung 670Z5E
ACPI / hotplug / PCI: Check presence of slot itself in get_slot_status()
USB:fix USB3 devices behind USB3 hubs not resuming at hibernate thaw
usb: dwc3: pci: Properly cleanup resource
HID: i2c-hid: fix size check and type usage
powerpc/powernv: Handle unknown OPAL errors in opal_nvram_write()
powerpc/64: Fix smp_wmb barrier definition use use lwsync consistently
powerpc/powernv: define a standard delay for OPAL_BUSY type retry loops
powerpc/powernv: Fix OPAL NVRAM driver OPAL_BUSY loops
HID: Fix hid_report_len usage
HID: core: Fix size as type u32
ASoC: ssm2602: Replace reg_default_raw with reg_default
thunderbolt: Resume control channel after hibernation image is created
random: use a tighter cap in credit_entropy_bits_safe()
jbd2: if the journal is aborted then don't allow update of the log tail
ext4: don't update checksum of new initialized bitmaps
ext4: fail ext4_iget for root directory if unallocated
RDMA/ucma: Don't allow setting RDMA_OPTION_IB_PATH without an RDMA device
ALSA: pcm: Fix UAF at PCM release via PCM timer access
IB/srp: Fix srp_abort()
IB/srp: Fix completion vector assignment algorithm
dmaengine: at_xdmac: fix rare residue corruption
um: Use POSIX ucontext_t instead of struct ucontext
iommu/vt-d: Fix a potential memory leak
mmc: jz4740: Fix race condition in IRQ mask update
clk: mvebu: armada-38x: add support for 1866MHz variants
clk: mvebu: armada-38x: add support for missing clocks
clk: bcm2835: De-assert/assert PLL reset signal when appropriate
thermal: imx: Fix race condition in imx_thermal_probe()
watchdog: f71808e_wdt: Fix WD_EN register read
ALSA: oss: consolidate kmalloc/memset 0 call to kzalloc
ALSA: pcm: Use ERESTARTSYS instead of EINTR in OSS emulation
ALSA: pcm: Avoid potential races between OSS ioctls and read/write
ALSA: pcm: Return -EBUSY for OSS ioctls changing busy streams
ALSA: pcm: Fix mutex unbalance in OSS emulation ioctls
ALSA: pcm: Fix endless loop for XRUN recovery in OSS emulation
vfio-pci: Virtualize PCIe & AF FLR
vfio/pci: Virtualize Maximum Payload Size
vfio/pci: Virtualize Maximum Read Request Size
ext4: don't allow r/w mounts if metadata blocks overlap the superblock
drm/radeon: Fix PCIe lane width calculation
ext4: fix crashes in dioread_nolock mode
ext4: fix deadlock between inline_data and ext4_expand_extra_isize_ea()
ALSA: line6: Use correct endpoint type for midi output
ALSA: rawmidi: Fix missing input substream checks in compat ioctls
ALSA: hda - New VIA controller suppor no-snoop path
HID: hidraw: Fix crash on HIDIOCGFEATURE with a destroyed device
MIPS: uaccess: Add micromips clobbers to bzero invocation
MIPS: memset.S: EVA & fault support for small_memset
MIPS: memset.S: Fix return of __clear_user from Lpartial_fixup
MIPS: memset.S: Fix clobber of v1 in last_fixup
powerpc/eeh: Fix enabling bridge MMIO windows
powerpc/lib: Fix off-by-one in alternate feature patching
jffs2_kill_sb(): deal with failed allocations
hypfs_kill_super(): deal with failed allocations
rpc_pipefs: fix double-dput()
Don't leak MNT_INTERNAL away from internal mounts
autofs: mount point create should honour passed in mode
mm: allow GFP_{FS,IO} for page_cache_read page cache allocation
mm/filemap.c: fix NULL pointer in page_cache_tree_insert()
ext4: bugfix for mmaped pages in mpage_release_unused_pages()
fanotify: fix logic of events on child
writeback: safer lock nesting
Linux 4.4.129
Change-Id: I8806d2cc92fe512f27a349e8f630ced0cac9a8d7
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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commit 16a34adb9392b2fe4195267475ab5b472e55292c upstream.
We want it only for the stuff created by SB_KERNMOUNT mounts, *not* for
their copies. As it is, creating a deep stack of bindings of /proc/*/ns/*
somewhere in a new namespace and exiting yields a stack overflow.
Cc: stable@kernel.org
Reported-by: Alexander Aring <aring@mojatatu.com>
Bisected-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Tested-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Tested-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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* refs/heads/tmp-29d0b65
Linux 4.4.88
xfs: XFS_IS_REALTIME_INODE() should be false if no rt device present
NFS: Fix 2 use after free issues in the I/O code
ARM: 8692/1: mm: abort uaccess retries upon fatal signal
Bluetooth: Properly check L2CAP config option output buffer length
ALSA: msnd: Optimize / harden DSP and MIDI loops
locktorture: Fix potential memory leak with rw lock test
btrfs: resume qgroup rescan on rw remount
drm/bridge: adv7511: Re-write the i2c address before EDID probing
drm/bridge: adv7511: Switch to using drm_kms_helper_hotplug_event()
drm/bridge: adv7511: Use work_struct to defer hotplug handing to out of irq context
drm/bridge: adv7511: Fix mutex deadlock when interrupts are disabled
drm: adv7511: really enable interrupts for EDID detection
scsi: sg: recheck MMAP_IO request length with lock held
scsi: sg: protect against races between mmap() and SG_SET_RESERVED_SIZE
cs5536: add support for IDE controller variant
workqueue: Fix flag collision
drm/nouveau/pci/msi: disable MSI on big-endian platforms by default
mwifiex: correct channel stat buffer overflows
dlm: avoid double-free on error path in dlm_device_{register,unregister}
Bluetooth: Add support of 13d3:3494 RTL8723BE device
rtlwifi: rtl_pci_probe: Fix fail path of _rtl_pci_find_adapter
Input: trackpoint - assume 3 buttons when buttons detection fails
ath10k: fix memory leak in rx ring buffer allocation
intel_th: pci: Add Cannon Lake PCH-LP support
intel_th: pci: Add Cannon Lake PCH-H support
driver core: bus: Fix a potential double free
staging/rts5208: fix incorrect shift to extract upper nybble
USB: core: Avoid race of async_completed() w/ usbdev_release()
usb:xhci:Fix regression when ATI chipsets detected
usb: Add device quirk for Logitech HD Pro Webcam C920-C
USB: serial: option: add support for D-Link DWM-157 C1
usb: quirks: add delay init quirk for Corsair Strafe RGB keyboard
ANDROID: sdcardfs: Add missing break
ANDROID: Sdcardfs: Move gid derivation under flag
ANDROID: mnt: Fix freeing of mount data
drivers: cpufreq: checks to avoid kernel crash in cpufreq_interactive
ANDROID: Use sk_uid to replace uid get from socket file
ANDROID: nf: xt_qtaguid: fix handling for cases where tunnels are used.
Revert "ANDROID: Use sk_uid to replace uid get from socket file"
ANDROID: fiq_debugger: Fix minor bug in code
Conflicts:
drivers/cpufreq/cpufreq_interactive.c
drivers/net/wireless/ath/ath10k/core.c
drivers/staging/android/fiq_debugger/fiq_debugger.c
net/netfilter/xt_qtaguid.c
Change-Id: I49c67ff84d4bee0799691cc1ee0a023e2dd13e66
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>
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Fix double free on error paths
Signed-off-by: Daniel Rosenberg <drosen@google.com>
Change-Id: I1c25a175e87e5dd5cafcdcf9d78bf4c0dc3f88ef
Bug: 65386954
Fixes: 6b42d02561d3 ("ANDROID: mnt: Add filesystem private data to mount points")
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Changes in 4.4.78
net_sched: fix error recovery at qdisc creation
net: sched: Fix one possible panic when no destroy callback
net/phy: micrel: configure intterupts after autoneg workaround
ipv6: avoid unregistering inet6_dev for loopback
net: dp83640: Avoid NULL pointer dereference.
tcp: reset sk_rx_dst in tcp_disconnect()
net: prevent sign extension in dev_get_stats()
bpf: prevent leaking pointer via xadd on unpriviledged
net: handle NAPI_GRO_FREE_STOLEN_HEAD case also in napi_frags_finish()
ipv6: dad: don't remove dynamic addresses if link is down
net: ipv6: Compare lwstate in detecting duplicate nexthops
vrf: fix bug_on triggered by rx when destroying a vrf
rds: tcp: use sock_create_lite() to create the accept socket
brcmfmac: fix possible buffer overflow in brcmf_cfg80211_mgmt_tx()
cfg80211: Define nla_policy for NL80211_ATTR_LOCAL_MESH_POWER_MODE
cfg80211: Validate frequencies nested in NL80211_ATTR_SCAN_FREQUENCIES
cfg80211: Check if PMKID attribute is of expected size
irqchip/gic-v3: Fix out-of-bound access in gic_set_affinity
parisc: Report SIGSEGV instead of SIGBUS when running out of stack
parisc: use compat_sys_keyctl()
parisc: DMA API: return error instead of BUG_ON for dma ops on non dma devs
parisc/mm: Ensure IRQs are off in switch_mm()
tools/lib/lockdep: Reduce MAX_LOCK_DEPTH to avoid overflowing lock_chain/: Depth
kernel/extable.c: mark core_kernel_text notrace
mm/list_lru.c: fix list_lru_count_node() to be race free
fs/dcache.c: fix spin lockup issue on nlru->lock
checkpatch: silence perl 5.26.0 unescaped left brace warnings
binfmt_elf: use ELF_ET_DYN_BASE only for PIE
arm: move ELF_ET_DYN_BASE to 4MB
arm64: move ELF_ET_DYN_BASE to 4GB / 4MB
powerpc: move ELF_ET_DYN_BASE to 4GB / 4MB
s390: reduce ELF_ET_DYN_BASE
exec: Limit arg stack to at most 75% of _STK_LIM
vt: fix unchecked __put_user() in tioclinux ioctls
mnt: In umount propagation reparent in a separate pass
mnt: In propgate_umount handle visiting mounts in any order
mnt: Make propagate_umount less slow for overlapping mount propagation trees
selftests/capabilities: Fix the test_execve test
tpm: Get rid of chip->pdev
tpm: Provide strong locking for device removal
Add "shutdown" to "struct class".
tpm: Issue a TPM2_Shutdown for TPM2 devices.
mm: fix overflow check in expand_upwards()
crypto: talitos - Extend max key length for SHA384/512-HMAC and AEAD
crypto: atmel - only treat EBUSY as transient if backlog
crypto: sha1-ssse3 - Disable avx2
crypto: caam - fix signals handling
sched/topology: Fix overlapping sched_group_mask
sched/topology: Optimize build_group_mask()
PM / wakeirq: Convert to SRCU
PM / QoS: return -EINVAL for bogus strings
tracing: Use SOFTIRQ_OFFSET for softirq dectection for more accurate results
KVM: x86: disable MPX if host did not enable MPX XSAVE features
kvm: vmx: Do not disable intercepts for BNDCFGS
kvm: x86: Guest BNDCFGS requires guest MPX support
kvm: vmx: Check value written to IA32_BNDCFGS
kvm: vmx: allow host to access guest MSR_IA32_BNDCFGS
Linux 4.4.78
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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commit 99b19d16471e9c3faa85cad38abc9cbbe04c6d55 upstream.
While investigating some poor umount performance I realized that in
the case of overlapping mount trees where some of the mounts are locked
the code has been failing to unmount all of the mounts it should
have been unmounting.
This failure to unmount all of the necessary
mounts can be reproduced with:
$ cat locked_mounts_test.sh
mount -t tmpfs test-base /mnt
mount --make-shared /mnt
mkdir -p /mnt/b
mount -t tmpfs test1 /mnt/b
mount --make-shared /mnt/b
mkdir -p /mnt/b/10
mount -t tmpfs test2 /mnt/b/10
mount --make-shared /mnt/b/10
mkdir -p /mnt/b/10/20
mount --rbind /mnt/b /mnt/b/10/20
unshare -Urm --propagation unchaged /bin/sh -c 'sleep 5; if [ $(grep test /proc/self/mountinfo | wc -l) -eq 1 ] ; then echo SUCCESS ; else echo FAILURE ; fi'
sleep 1
umount -l /mnt/b
wait %%
$ unshare -Urm ./locked_mounts_test.sh
This failure is corrected by removing the prepass that marks mounts
that may be umounted.
A first pass is added that umounts mounts if possible and if not sets
mount mark if they could be unmounted if they weren't locked and adds
them to a list to umount possibilities. This first pass reconsiders
the mounts parent if it is on the list of umount possibilities, ensuring
that information of umoutability will pass from child to mount parent.
A second pass then walks through all mounts that are umounted and processes
their children unmounting them or marking them for reparenting.
A last pass cleans up the state on the mounts that could not be umounted
and if applicable reparents them to their first parent that remained
mounted.
While a bit longer than the old code this code is much more robust
as it allows information to flow up from the leaves and down
from the trunk making the order in which mounts are encountered
in the umount propgation tree irrelevant.
Fixes: 0c56fe31420c ("mnt: Don't propagate unmounts to locked mounts")
Reviewed-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 570487d3faf2a1d8a220e6ee10f472163123d7da upstream.
It was observed that in some pathlogical cases that the current code
does not unmount everything it should. After investigation it
was determined that the issue is that mnt_change_mntpoint can
can change which mounts are available to be unmounted during mount
propagation which is wrong.
The trivial reproducer is:
$ cat ./pathological.sh
mount -t tmpfs test-base /mnt
cd /mnt
mkdir 1 2 1/1
mount --bind 1 1
mount --make-shared 1
mount --bind 1 2
mount --bind 1/1 1/1
mount --bind 1/1 1/1
echo
grep test-base /proc/self/mountinfo
umount 1/1
echo
grep test-base /proc/self/mountinfo
$ unshare -Urm ./pathological.sh
The expected output looks like:
46 31 0:25 / /mnt rw,relatime - tmpfs test-base rw,uid=1000,gid=1000
47 46 0:25 /1 /mnt/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
48 46 0:25 /1 /mnt/2 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
49 54 0:25 /1/1 /mnt/1/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
50 53 0:25 /1/1 /mnt/2/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
51 49 0:25 /1/1 /mnt/1/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
54 47 0:25 /1/1 /mnt/1/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
53 48 0:25 /1/1 /mnt/2/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
52 50 0:25 /1/1 /mnt/2/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
46 31 0:25 / /mnt rw,relatime - tmpfs test-base rw,uid=1000,gid=1000
47 46 0:25 /1 /mnt/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
48 46 0:25 /1 /mnt/2 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
The output without the fix looks like:
46 31 0:25 / /mnt rw,relatime - tmpfs test-base rw,uid=1000,gid=1000
47 46 0:25 /1 /mnt/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
48 46 0:25 /1 /mnt/2 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
49 54 0:25 /1/1 /mnt/1/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
50 53 0:25 /1/1 /mnt/2/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
51 49 0:25 /1/1 /mnt/1/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
54 47 0:25 /1/1 /mnt/1/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
53 48 0:25 /1/1 /mnt/2/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
52 50 0:25 /1/1 /mnt/2/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
46 31 0:25 / /mnt rw,relatime - tmpfs test-base rw,uid=1000,gid=1000
47 46 0:25 /1 /mnt/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
48 46 0:25 /1 /mnt/2 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
52 48 0:25 /1/1 /mnt/2/1 rw,relatime shared:1 - tmpfs test-base rw,uid=1000,gid=1000
That last mount in the output was in the propgation tree to be unmounted but
was missed because the mnt_change_mountpoint changed it's parent before the walk
through the mount propagation tree observed it.
Fixes: 1064f874abc0 ("mnt: Tuck mounts under others instead of creating shadow/side mounts.")
Acked-by: Andrei Vagin <avagin@virtuozzo.com>
Reviewed-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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When umount of a partition fails with EBUSY there is
no indication as to what is keeping the mount point busy.
Add support to print a kernel log showing what files
are open on this mount point.
Also add a new new config option CONFIG_FILE_TABLE_DEBUG to
enable this feature.
Change-Id: Id7a3f5e7291b22ffd0f265848ec0a9757f713561
Signed-off-by: Nikhilesh Reddy <reddyn@codeaurora.org>
Signed-off-by: Ankit Jain <ankijain@codeaurora.org>
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Changes in 4.4.65:
tipc: make sure IPv6 header fits in skb headroom
tipc: make dist queue pernet
tipc: re-enable compensation for socket receive buffer double counting
tipc: correct error in node fsm
tty: nozomi: avoid a harmless gcc warning
hostap: avoid uninitialized variable use in hfa384x_get_rid
gfs2: avoid uninitialized variable warning
tipc: fix random link resets while adding a second bearer
tipc: fix socket timer deadlock
mnt: Add a per mount namespace limit on the number of mounts
xc2028: avoid use after free
netfilter: nfnetlink: correctly validate length of batch messages
tipc: check minimum bearer MTU
vfio/pci: Fix integer overflows, bitmask check
staging/android/ion : fix a race condition in the ion driver
ping: implement proper locking
perf/core: Fix concurrent sys_perf_event_open() vs. 'move_group' race
Linux 4.4.65
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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commit d29216842a85c7970c536108e093963f02714498 upstream.
CAI Qian <caiqian@redhat.com> pointed out that the semantics
of shared subtrees make it possible to create an exponentially
increasing number of mounts in a mount namespace.
mkdir /tmp/1 /tmp/2
mount --make-rshared /
for i in $(seq 1 20) ; do mount --bind /tmp/1 /tmp/2 ; done
Will create create 2^20 or 1048576 mounts, which is a practical problem
as some people have managed to hit this by accident.
As such CVE-2016-6213 was assigned.
Ian Kent <raven@themaw.net> described the situation for autofs users
as follows:
> The number of mounts for direct mount maps is usually not very large because of
> the way they are implemented, large direct mount maps can have performance
> problems. There can be anywhere from a few (likely case a few hundred) to less
> than 10000, plus mounts that have been triggered and not yet expired.
>
> Indirect mounts have one autofs mount at the root plus the number of mounts that
> have been triggered and not yet expired.
>
> The number of autofs indirect map entries can range from a few to the common
> case of several thousand and in rare cases up to between 30000 and 50000. I've
> not heard of people with maps larger than 50000 entries.
>
> The larger the number of map entries the greater the possibility for a large
> number of active mounts so it's not hard to expect cases of a 1000 or somewhat
> more active mounts.
So I am setting the default number of mounts allowed per mount
namespace at 100,000. This is more than enough for any use case I
know of, but small enough to quickly stop an exponential increase
in mounts. Which should be perfect to catch misconfigurations and
malfunctioning programs.
For anyone who needs a higher limit this can be changed by writing
to the new /proc/sys/fs/mount-max sysctl.
Tested-by: CAI Qian <caiqian@redhat.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
[bwh: Backported to 4.4: adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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am: 839d42687d
Change-Id: Id06d474c7f7b46c1ce05056028ca02837cacf215
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commit 1064f874abc0d05eeed8993815f584d847b72486 upstream.
Ever since mount propagation was introduced in cases where a mount in
propagated to parent mount mountpoint pair that is already in use the
code has placed the new mount behind the old mount in the mount hash
table.
This implementation detail is problematic as it allows creating
arbitrary length mount hash chains.
Furthermore it invalidates the constraint maintained elsewhere in the
mount code that a parent mount and a mountpoint pair will have exactly
one mount upon them. Making it hard to deal with and to talk about
this special case in the mount code.
Modify mount propagation to notice when there is already a mount at
the parent mount and mountpoint where a new mount is propagating to
and place that preexisting mount on top of the new mount.
Modify unmount propagation to notice when a mount that is being
unmounted has another mount on top of it (and no other children), and
to replace the unmounted mount with the mount on top of it.
Move the MNT_UMUONT test from __lookup_mnt_last into
__propagate_umount as that is the only call of __lookup_mnt_last where
MNT_UMOUNT may be set on any mount visible in the mount hash table.
These modifications allow:
- __lookup_mnt_last to be removed.
- attach_shadows to be renamed __attach_mnt and its shadow
handling to be removed.
- commit_tree to be simplified
- copy_tree to be simplified
The result is an easier to understand tree of mounts that does not
allow creation of arbitrary length hash chains in the mount hash table.
The result is also a very slight userspace visible difference in semantics.
The following two cases now behave identically, where before order
mattered:
case 1: (explicit user action)
B is a slave of A
mount something on A/a , it will propagate to B/a
and than mount something on B/a
case 2: (tucked mount)
B is a slave of A
mount something on B/a
and than mount something on A/a
Histroically umount A/a would fail in case 1 and succeed in case 2.
Now umount A/a succeeds in both configurations.
This very small change in semantics appears if anything to be a bug
fix to me and my survey of userspace leads me to believe that no programs
will notice or care of this subtle semantic change.
v2: Updated to mnt_change_mountpoint to not call dput or mntput
and instead to decrement the counts directly. It is guaranteed
that there will be other references when mnt_change_mountpoint is
called so this is safe.
v3: Moved put_mountpoint under mount_lock in attach_recursive_mnt
As the locking in fs/namespace.c changed between v2 and v3.
v4: Reworked the logic in propagate_mount_busy and __propagate_umount
that detects when a mount completely covers another mount.
v5: Removed unnecessary tests whose result is alwasy true in
find_topper and attach_recursive_mnt.
v6: Document the user space visible semantic difference.
Fixes: b90fa9ae8f51 ("[PATCH] shared mount handling: bind and rbind")
Tested-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Change-Id: Icf907f5067fb6da5935ab0d3271df54b8d5df405
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Now we pass the vfsmount when mounting and remounting.
This allows the filesystem to actually set up the mount
specific data, although we can't quite do anything with
it yet. show_options is expanded to include data that
lives with the mount.
To avoid changing existing filesystems, these have
been added as new vfs functions.
Change-Id: If80670bfad9f287abb8ac22457e1b034c9697097
Signed-off-by: Daniel Rosenberg <drosen@google.com>
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This starts to add private data associated directly
to mount points. The intent is to give filesystems
a sense of where they have come from, as a means of
letting a filesystem take different actions based on
this information.
Change-Id: Ie769d7b3bb2f5972afe05c1bf16cf88c91647ab2
Signed-off-by: Daniel Rosenberg <drosen@google.com>
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commit 3895dbf8985f656675b5bde610723a29cbce3fa7 upstream.
Protecting the mountpoint hashtable with namespace_sem was sufficient
until a call to umount_mnt was added to mntput_no_expire. At which
point it became possible for multiple calls of put_mountpoint on
the same hash chain to happen on the same time.
Kristen Johansen <kjlx@templeofstupid.com> reported:
> This can cause a panic when simultaneous callers of put_mountpoint
> attempt to free the same mountpoint. This occurs because some callers
> hold the mount_hash_lock, while others hold the namespace lock. Some
> even hold both.
>
> In this submitter's case, the panic manifested itself as a GP fault in
> put_mountpoint() when it called hlist_del() and attempted to dereference
> a m_hash.pprev that had been poisioned by another thread.
Al Viro observed that the simple fix is to switch from using the namespace_sem
to the mount_lock to protect the mountpoint hash table.
I have taken Al's suggested patch moved put_mountpoint in pivot_root
(instead of taking mount_lock an additional time), and have replaced
new_mountpoint with get_mountpoint a function that does the hash table
lookup and addition under the mount_lock. The introduction of get_mounptoint
ensures that only the mount_lock is needed to manipulate the mountpoint
hashtable.
d_set_mounted is modified to only set DCACHE_MOUNTED if it is not
already set. This allows get_mountpoint to use the setting of
DCACHE_MOUNTED to ensure adding a struct mountpoint for a dentry
happens exactly once.
Fixes: ce07d891a089 ("mnt: Honor MNT_LOCKED when detaching mounts")
Reported-by: Krister Johansen <kjlx@templeofstupid.com>
Suggested-by: Al Viro <viro@ZenIV.linux.org.uk>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit e06b933e6ded42384164d28a2060b7f89243b895 upstream.
- m_start() in fs/namespace.c expects that ns->event is incremented each
time a mount added or removed from ns->list.
- umount_tree() removes items from the list but does not increment event
counter, expecting that it's done before the function is called.
- There are some codepaths that call umount_tree() without updating
"event" counter. e.g. from __detach_mounts().
- When this happens m_start may reuse a cached mount structure that no
longer belongs to ns->list (i.e. use after free which usually leads
to infinite loop).
This change fixes the above problem by incrementing global event counter
before invoking umount_tree().
Change-Id: I622c8e84dcb9fb63542372c5dbf0178ee86bb589
Signed-off-by: Andrey Ulanov <andreyu@google.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 97c1df3e54e811aed484a036a798b4b25d002ecf upstream.
Add this trivial missing error handling.
Fixes: 1b852bceb0d1 ("mnt: Refactor the logic for mounting sysfs and proc in a user namespace")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 695e9df010e40f407f4830dc11d53dce957710ba upstream.
In rare cases it is possible for s_flags & MS_RDONLY to be set but
MNT_READONLY to be clear. This starting combination can cause
fs_fully_visible to fail to ensure that the new mount is readonly.
Therefore force MNT_LOCK_READONLY in the new mount if MS_RDONLY
is set on the source filesystem of the mount.
In general both MS_RDONLY and MNT_READONLY are set at the same for
mounts so I don't expect any programs to care. Nor do I expect
MS_RDONLY to be set on proc or sysfs in the initial user namespace,
which further decreases the likelyhood of problems.
Which means this change should only affect system configurations by
paranoid sysadmins who should welcome the additional protection
as it keeps people from wriggling out of their policies.
Fixes: 8c6cf9cc829f ("mnt: Modify fs_fully_visible to deal with locked ro nodev and atime")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit d71ed6c930ac7d8f88f3cef6624a7e826392d61f upstream.
MNT_LOCKED implies on a child mount implies the child is locked to the
parent. So while looping through the children the children should be
tested (not their parent).
Typically an unshare of a mount namespace locks all mounts together
making both the parent and the slave as locked but there are a few
corner cases where other things work.
Fixes: ceeb0e5d39fc ("vfs: Ignore unlocked mounts in fs_fully_visible")
Reported-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull user namespace updates from Eric Biederman:
"This finishes up the changes to ensure proc and sysfs do not start
implementing executable files, as the there are application today that
are only secure because such files do not exist.
It akso fixes a long standing misfeature of /proc/<pid>/mountinfo that
did not show the proper source for files bind mounted from
/proc/<pid>/ns/*.
It also straightens out the handling of clone flags related to user
namespaces, fixing an unnecessary failure of unshare(CLONE_NEWUSER)
when files such as /proc/<pid>/environ are read while <pid> is calling
unshare. This winds up fixing a minor bug in unshare flag handling
that dates back to the first version of unshare in the kernel.
Finally, this fixes a minor regression caused by the introduction of
sysfs_create_mount_point, which broke someone's in house application,
by restoring the size of /sys/fs/cgroup to 0 bytes. Apparently that
application uses the directory size to determine if a tmpfs is mounted
on /sys/fs/cgroup.
The bind mount escape fixes are present in Al Viros for-next branch.
and I expect them to come from there. The bind mount escape is the
last of the user namespace related security bugs that I am aware of"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
fs: Set the size of empty dirs to 0.
userns,pidns: Force thread group sharing, not signal handler sharing.
unshare: Unsharing a thread does not require unsharing a vm
nsfs: Add a show_path method to fix mountinfo
mnt: fs_fully_visible enforce noexec and nosuid if !SB_I_NOEXEC
vfs: Commit to never having exectuables on proc and sysfs.
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The filesystems proc and sysfs do not have executable files do not
have exectuable files today and portions of userspace break if we do
enforce nosuid and noexec consistency of nosuid and noexec flags
between previous mounts and new mounts of proc and sysfs.
Add the code to enforce consistency of the nosuid and noexec flags,
and use the presence of SB_I_NOEXEC to signal that there is no need to
bother.
This results in a completely userspace invisible change that makes it
clear fs_fully_visible can only skip the enforcement of noexec and
nosuid because it is known the filesystems in question do not support
executables.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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The handling of in detach_mounts of unmounted but connected mounts is
buggy and can lead to an infinite loop.
Correct the handling of unmounted mounts in detach_mount. When the
mountpoint of an unmounted but connected mount is connected to a
dentry, and that dentry is deleted we need to disconnect that mount
from the parent mount and the deleted dentry.
Nothing changes for the unmounted and connected children. They can be
safely ignored.
Cc: stable@vger.kernel.org
Fixes: ce07d891a0891d3c0d0c2d73d577490486b809e1 mnt: Honor MNT_LOCKED when detaching mounts
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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rmdir mntpoint will result in an infinite loop when there is
a mount locked on the mountpoint in another mount namespace.
This is because the logic to test to see if a mount should
be disconnected in umount_tree is buggy.
Move the logic to decide if a mount should remain connected to
it's mountpoint into it's own function disconnect_mount so that
clarity of expression instead of terseness of expression becomes
a virtue.
When the conditions where it is invalid to leave a mount connected
are first ruled out, the logic for deciding if a mount should
be disconnected becomes much clearer and simpler.
Fixes: e0c9c0afd2fc958ffa34b697972721d81df8a56f mnt: Update detach_mounts to leave mounts connected
Fixes: ce07d891a0891d3c0d0c2d73d577490486b809e1 mnt: Honor MNT_LOCKED when detaching mounts
Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull user namespace updates from Eric Biederman:
"Long ago and far away when user namespaces where young it was realized
that allowing fresh mounts of proc and sysfs with only user namespace
permissions could violate the basic rule that only root gets to decide
if proc or sysfs should be mounted at all.
Some hacks were put in place to reduce the worst of the damage could
be done, and the common sense rule was adopted that fresh mounts of
proc and sysfs should allow no more than bind mounts of proc and
sysfs. Unfortunately that rule has not been fully enforced.
There are two kinds of gaps in that enforcement. Only filesystems
mounted on empty directories of proc and sysfs should be ignored but
the test for empty directories was insufficient. So in my tree
directories on proc, sysctl and sysfs that will always be empty are
created specially. Every other technique is imperfect as an ordinary
directory can have entries added even after a readdir returns and
shows that the directory is empty. Special creation of directories
for mount points makes the code in the kernel a smidge clearer about
it's purpose. I asked container developers from the various container
projects to help test this and no holes were found in the set of mount
points on proc and sysfs that are created specially.
This set of changes also starts enforcing the mount flags of fresh
mounts of proc and sysfs are consistent with the existing mount of
proc and sysfs. I expected this to be the boring part of the work but
unfortunately unprivileged userspace winds up mounting fresh copies of
proc and sysfs with noexec and nosuid clear when root set those flags
on the previous mount of proc and sysfs. So for now only the atime,
read-only and nodev attributes which userspace happens to keep
consistent are enforced. Dealing with the noexec and nosuid
attributes remains for another time.
This set of changes also addresses an issue with how open file
descriptors from /proc/<pid>/ns/* are displayed. Recently readlink of
/proc/<pid>/fd has been triggering a WARN_ON that has not been
meaningful since it was added (as all of the code in the kernel was
converted) and is not now actively wrong.
There is also a short list of issues that have not been fixed yet that
I will mention briefly.
It is possible to rename a directory from below to above a bind mount.
At which point any directory pointers below the renamed directory can
be walked up to the root directory of the filesystem. With user
namespaces enabled a bind mount of the bind mount can be created
allowing the user to pick a directory whose children they can rename
to outside of the bind mount. This is challenging to fix and doubly
so because all obvious solutions must touch code that is in the
performance part of pathname resolution.
As mentioned above there is also a question of how to ensure that
developers by accident or with purpose do not introduce exectuable
files on sysfs and proc and in doing so introduce security regressions
in the current userspace that will not be immediately obvious and as
such are likely to require breaking userspace in painful ways once
they are recognized"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
vfs: Remove incorrect debugging WARN in prepend_path
mnt: Update fs_fully_visible to test for permanently empty directories
sysfs: Create mountpoints with sysfs_create_mount_point
sysfs: Add support for permanently empty directories to serve as mount points.
kernfs: Add support for always empty directories.
proc: Allow creating permanently empty directories that serve as mount points
sysctl: Allow creating permanently empty directories that serve as mountpoints.
fs: Add helper functions for permanently empty directories.
vfs: Ignore unlocked mounts in fs_fully_visible
mnt: Modify fs_fully_visible to deal with locked ro nodev and atime
mnt: Refactor the logic for mounting sysfs and proc in a user namespace
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fs_fully_visible attempts to make fresh mounts of proc and sysfs give
the mounter no more access to proc and sysfs than if they could have
by creating a bind mount. One aspect of proc and sysfs that makes
this particularly tricky is that there are other filesystems that
typically mount on top of proc and sysfs. As those filesystems are
mounted on empty directories in practice it is safe to ignore them.
However testing to ensure filesystems are mounted on empty directories
has not been something the in kernel data structures have supported so
the current test for an empty directory which checks to see
if nlink <= 2 is a bit lacking.
proc and sysfs have recently been modified to use the new empty_dir
infrastructure to create all of their dedicated mount points. Instead
of testing for S_ISDIR(inode->i_mode) && i_nlink <= 2 to see if a
directory is empty, test for is_empty_dir_inode(inode). That small
change guaranteess mounts found on proc and sysfs really are safe to
ignore, because the directories are not only empty but nothing can
ever be added to them. This guarantees there is nothing to worry
about when mounting proc and sysfs.
Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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Limit the mounts fs_fully_visible considers to locked mounts.
Unlocked can always be unmounted so considering them adds hassle
but no security benefit.
Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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Ignore an existing mount if the locked readonly, nodev or atime
attributes are less permissive than the desired attributes
of the new mount.
On success ensure the new mount locks all of the same readonly, nodev and
atime attributes as the old mount.
The nosuid and noexec attributes are not checked here as this change
is destined for stable and enforcing those attributes causes a
regression in lxc and libvirt-lxc where those applications will not
start and there are no known executables on sysfs or proc and no known
way to create exectuables without code modifications
Cc: stable@vger.kernel.org
Fixes: e51db73532955 ("userns: Better restrictions on when proc and sysfs can be mounted")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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